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Fldigi (short for Fast light digital) is a
free and open-source
Free and open-source software (FOSS) is a term used to refer to groups of software consisting of both free software and open-source software where anyone is freely licensed to use, copy, study, and change the software in any way, and the source ...
program which allows an ordinary computer's sound card
A sound card (also known as an audio card) is an internal expansion card that provides input and output of audio signals to and from a computer under the control of computer programs. The term ''sound card'' is also applied to external audio i ...
to be used as a simple two-way data modem. The software is mostly used by amateur radio operators
An amateur radio operator is someone who uses equipment at an amateur radio station to engage in two-way personal communications with other amateur operators on radio frequencies assigned to the amateur radio service. Amateur radio operators hav ...
who connect the microphone
A microphone, colloquially called a mic or mike (), is a transducer that converts sound into an electrical signal. Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public ...
and headphone
Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an au ...
connections of an amateur radio
Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communic ...
SSB or FM transceiver
In radio communication, a transceiver is an electronic device which is a combination of a radio ''trans''mitter and a re''ceiver'', hence the name. It can both transmit and receive radio waves using an antenna, for communication purposes. The ...
to the computer's headphone and microphone connections, respectively.
This interconnection creates a "sound card defined radio" whose available bandwidth
Bandwidth commonly refers to:
* Bandwidth (signal processing) or ''analog bandwidth'', ''frequency bandwidth'', or ''radio bandwidth'', a measure of the width of a frequency range
* Bandwidth (computing), the rate of data transfer, bit rate or thr ...
is limited by the sound card's sample rate and the external radio's bandwidth.
Such communications are normally done on the shortwave amateur radio bands
Amateur radio frequency allocation is done by national telecommunication authorities. Globally, the International Telecommunication Union (ITU) oversees how much radio spectrum is set aside for amateur radio transmissions. Individual amateur sta ...
in modes such as PSK31
PSK31 or " Phase Shift Keying, 31 Baud", also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-to-keyboard chat, most often using frequenci ...
, MFSK
Multiple frequency-shift keying (MFSK) is a variation of frequency-shift keying (FSK) that uses more than two frequencies. MFSK is a form of M-ary orthogonal modulation, where each symbol consists of one element from an alphabet of orthogonal wave ...
, RTTY
Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link. Radioteletype evolved from earlier landline teleprinter o ...
, Olivia Olivia may refer to:
People
* Olivia (name), including a list of people and fictional characters with the name
* Olivia (singer) (Olivia Longott, born 1981), American singer
* Olívia (basketball) (Carlos Henrique Rodrigues do Nascimento, born 19 ...
, and CW (Morse code). Increasingly, the software is also being used for data on VHF and UHF frequencies using faster modes such as 8-PSK.
Using this software, it is possible for amateur radio operators
An amateur radio operator is someone who uses equipment at an amateur radio station to engage in two-way personal communications with other amateur operators on radio frequencies assigned to the amateur radio service. Amateur radio operators hav ...
to communicate worldwide while using only a few watts of RF power.
Fldigi software is also used for amateur radio emergency communications
In times of crisis and natural disasters, amateur radio is often used as a means of emergency communication when wireline, cell phones and other conventional means of communications fail.
Unlike commercial systems, amateur radio is usually ...
when other communication systems fail due to natural disaster or power outage. Transfer of files, emails, and FEMA ICS forms are possible using inexpensive radio hardware.http://www.w1hkj.com/NBEMS/PublicService.pdf
Supported digital modes
Portability
Operating systems
Fldigi is based on the lightweight portable graphics library FLTK and the C/C++
C++ (pronounced "C plus plus") is a high-level general-purpose programming language created by Danish computer scientist Bjarne Stroustrup as an extension of the C programming language, or "C with Classes". The language has expanded significan ...
language. Because of this, the software can run on many different operating systems such as:
*Microsoft Windows
Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for serv ...
(2000
File:2000 Events Collage.png, From left, clockwise: Protests against Bush v. Gore after the 2000 United States presidential election; Heads of state meet for the Millennium Summit; The International Space Station in its infant form as seen from ...
or newer)
*macOS
macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and lapt ...
*Linux
Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...
,
*FreeBSD
FreeBSD is a free and open-source Unix-like operating system descended from the Berkeley Software Distribution (BSD), which was based on Research Unix. The first version of FreeBSD was released in 1993. In 2005, FreeBSD was the most popular ...
,
*OpenBSD
OpenBSD is a security-focused, free and open-source, Unix-like operating system based on the Berkeley Software Distribution (BSD). Theo de Raadt created OpenBSD in 1995 by forking NetBSD 1.0. According to the website, the OpenBSD project em ...
,
*NetBSD
NetBSD is a free and open-source Unix operating system based on the Berkeley Software Distribution (BSD). It was the first open-source BSD descendant officially released after 386BSD was forked. It continues to be actively developed and is a ...
,
*Solaris
Solaris may refer to:
Arts and entertainment Literature, television and film
* ''Solaris'' (novel), a 1961 science fiction novel by Stanisław Lem
** ''Solaris'' (1968 film), directed by Boris Nirenburg
** ''Solaris'' (1972 film), directed by ...
.
Additionally, Fldigi is designed to compile and run on any POSIX
The Portable Operating System Interface (POSIX) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. POSIX defines both the system- and user-level application programming interf ...
compliant operating system
An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs.
Time-sharing operating systems schedule tasks for efficient use of the system and may also in ...
that uses an X11
The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like operating systems.
X provides the basic framework for a GUI environment: drawing and moving windows on the display device and interacting wi ...
compatible window system / graphical user interface
The GUI ( "UI" by itself is still usually pronounced . or ), graphical user interface, is a form of user interface that allows users to interact with electronic devices through graphical icons and audio indicator such as primary notation, inste ...
.
Architectures
The Fldigi software is written in highlyportable
Portable may refer to:
General
* Portable building, a manufactured structure that is built off site and moved in upon completion of site and utility work
* Portable classroom, a temporary building installed on the grounds of a school to provide ...
C/C++
C++ (pronounced "C plus plus") is a high-level general-purpose programming language created by Danish computer scientist Bjarne Stroustrup as an extension of the C programming language, or "C with Classes". The language has expanded significan ...
and can be used on many CPU architectures
Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and constructing buildings o ...
, including:
*amd64
x86-64 (also known as x64, x86_64, AMD64, and Intel 64) is a 64-bit version of the x86 instruction set, first released in 1999. It introduced two new modes of operation, 64-bit mode and compatibility mode, along with a new 4-level paging m ...
*i386
The Intel 386, originally released as 80386 and later renamed i386, is a 32-bit microprocessor introduced in 1985. The first versions had 275,000 transistorsarmhf/armel
*
NBEMS
The narrowband emergency messaging system * Support for transmitting and receiving in all languages by using
ia64
IA-64 (Intel Itanium architecture) is the instruction set architecture (ISA) of the Itanium family of 64-bit Intel microprocessors. The basic ISA specification originated at Hewlett-Packard (HP), and was subsequently implemented by Intel in coll ...
* mips
* mipsel
*powerpc
PowerPC (with the backronym Performance Optimization With Enhanced RISC – Performance Computing, sometimes abbreviated as PPC) is a reduced instruction set computer (RISC) instruction set architecture (ISA) created by the 1991 Apple Inc., App ...
*s390
The IBM System/390 is a discontinued mainframe product family implementing the ESA/390, the fifth generation of the System/360 instruction set architecture. The first computers to use the ESA/390 were the Enterprise System/9000 (ES/9000) ...
*s390x
Linux on IBM Z or Linux on zSystems is the collective term for the Linux operating system compiled to run on IBM mainframes, especially IBM Z / IBM zSystems and IBM LinuxONE servers. Similar terms which imply the same meaning are ''Linux/390'', ...
*sparc
SPARC (Scalable Processor Architecture) is a reduced instruction set computer (RISC) instruction set architecture originally developed by Sun Microsystems. Its design was strongly influenced by the experimental Berkeley RISC system developed ...
*Raspberry Pi
Raspberry Pi () is a series of small single-board computers (SBCs) developed in the United Kingdom by the Raspberry Pi Foundation in association with Broadcom. The Raspberry Pi project originally leaned towards the promotion of teaching basic ...
.
Sound systems
Multiple sound systems are supported by Fldigi, allowing the program to abstract thesound card
A sound card (also known as an audio card) is an internal expansion card that provides input and output of audio signals to and from a computer under the control of computer programs. The term ''sound card'' is also applied to external audio i ...
hardware across differing hardware and operating systems.
*Open Sound System
The Open Sound System (OSS) is an interface for making and capturing sound in Unix and Unix-like operating systems. It is based on standard Unix devices system calls (i.e. POSIX read, write, ioctl, etc.). The term also sometimes refers to th ...
(OSS)
*Portaudio
PortAudio is an open-source computer library for audio playback and recording. It is a cross-platform library, so programs using it can run on many different computer operating systems, including Windows, Mac OS X and Linux. PortAudio supports ...
*Pulseaudio
PulseAudio is a network-capable sound server program distributed via the freedesktop.org project. It runs mainly on Linux, various BSD distributions such as FreeBSD and OpenBSD, macOS, as well as Illumos distributions and the Solaris operat ...
*Read / write to WAV
Waveform Audio File Format (WAVE, or WAV due to its filename extension; pronounced "wave") is an audio file format standard, developed by IBM and Microsoft, for storing an audio bitstream on PCs. It is the main format used on Microsoft Wind ...
files (file I/O)
Features
NBEMS
The narrowband emergency messaging system * Support for transmitting and receiving in all languages by using
UTF-8
UTF-8 is a variable-width encoding, variable-length character encoding used for electronic communication. Defined by the Unicode Standard, the name is derived from ''Unicode'' (or ''Universal Coded Character Set'') ''Transformation Format 8-bit'' ...
character encoding
Character encoding is the process of assigning numbers to Graphics, graphical character (computing), characters, especially the written characters of Language, human language, allowing them to be Data storage, stored, Data communication, transmi ...
(some modes)
* Connection to external programs via TCP/IP port 7322
* Ability to be used as a KISS
A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...
modem via TCP/IP port 7342
* Dual tone multi-frequency
Dual-tone multi-frequency signaling (DTMF) is a Signalling (telecommunications), telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and Automatic te ...
(DTMF
Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed ...
) encoding and decoding
* Automatic switching of mode and frequency by use of Reed Solomon Identifier signal identification
* Inbuilt macro language and processor for programmable automated control
* Sound card oscillator frequency/skew correction
* Measure sound card oscillator
Oscillation is the repetitive or periodic variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. Familiar examples of oscillation include a swinging pendulum ...
's skew to atomic clock
An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels. Electron states in an atom are associated with different energy levels, and in transitions betwee ...
: WWV or WWVH
WWVH is the callsign of the U.S. National Institute of Standards and Technology's shortwave radio time signal station located at the Barking Sands Missile Range, in Kekaha, on the island of Kauai in the state of Hawaii.
WWVH is the Pacific si ...
* Measure RF receiver frequency
Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as ''temporal frequency'' for clarity, and is distinct from ''angular frequency''. Frequency is measured in hertz (Hz) which is eq ...
skew to atomic clock
An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels. Electron states in an atom are associated with different energy levels, and in transitions betwee ...
: WWV or WWVH
WWVH is the callsign of the U.S. National Institute of Standards and Technology's shortwave radio time signal station located at the Barking Sands Missile Range, in Kekaha, on the island of Kauai in the state of Hawaii.
WWVH is the Pacific si ...
* Transmit a WWV-like time signal as a calibration reference
* Control of external transmit / receive radio hardware by using GPIO
A general-purpose input/output (GPIO) is an uncommitted digital signal pin on an integrated circuit or electronic circuit (e.g. MCUs/ MPUs ) board which may be used as an input or output, or both, and is controllable by software.
GPIOs have no ...
pins. (For embedded hardware)
* Simultaneous decoding of multiple morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
( CW) signals.
* Decoding of morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
( CW) by self-organizing map
A self-organizing map (SOM) or self-organizing feature map (SOFM) is an unsupervised machine learning technique used to produce a low-dimensional (typically two-dimensional) representation of a higher dimensional data set while preserving the t ...
artificial neural network
Artificial neural networks (ANNs), usually simply called neural networks (NNs) or neural nets, are computing systems inspired by the biological neural networks that constitute animal brains.
An ANN is based on a collection of connected unit ...
(trained artificial intelligence
Artificial intelligence (AI) is intelligence—perceiving, synthesizing, and inferring information—demonstrated by machines, as opposed to intelligence displayed by animals and humans. Example tasks in which this is done include speech re ...
)
The Fldigi Suite
The "Fldigi Suite" consists of the Fldigi modem and allextension
Extension, extend or extended may refer to:
Mathematics
Logic or set theory
* Axiom of extensionality
* Extensible cardinal
* Extension (model theory)
* Extension (predicate logic), the set of tuples of values that satisfy the predicate
* E ...
programs released by the same development group. Most of these extensions add more capabilities to Fldigi such as verified file transfer and message passing. Interconnection between these programs and the Fldigi modem is made over TCP/IP port 7322.
Some of the Suite are however standalone programs used for utility or testing purposes only, with no connection to the Fldigi main modem.
Flamp
/h2>
Flamp implements the Amateur Multicast Protocol by Dave Freese, W1HKJ and is a tool for connectionless transferring of files to multiple users simultaneously without requiring any existing infrastructure. The program breaks a given file into multiple smaller pieces, checksums each piece, then transmits each piece one or more times. When all parts are correctly received the sent file is re-assembled and can be saved by receiving stations. This program is useful for multicast
In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast should not be confused with ...
ing files over lossy connections such as those found on high frequency
High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten ...
or during emergency communications.
Flarq
/h2>
Flarq implements the ARQ specification developed by Paul Schmidt, K9PS to transfer emails, text files
A text file (sometimes spelled textfile; an old alternative name is flatfile) is a kind of computer file that is structured as a sequence of lines of electronic text. A text file exists stored as data within a computer file system. In operat ...
, images, and binary file
A binary file is a computer file that is not a text file. The term "binary file" is often used as a term meaning "non-text file". Many binary file formats contain parts that can be interpreted as text; for example, some computer document fil ...
s over radio. This protocol is unicast
Unicast is data transmission from a single sender (red) to a single receiver (green). Other devices on the network (yellow) do not participate in the communication.
In computer networking, unicast is a one-to-one transmission from one point in ...
and connection-based. The software seamlessly integrates with existing email clients such as Microsoft Outlook
Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft Office and Microsoft 365 software suites. Though primarily an email client, Outlook also includes such functions as Calen ...
, Mozilla Thunderbird
Mozilla Thunderbird is a free and open-source cross-platform email client, personal information manager, news client, RSS and chat client developed by the Mozilla Foundation and operated by subsidiary MZLA Technologies Corporation. The projec ...
, and Sylpheed.
Flmsg
/h2>
Flmsg allows users to send, receive, edit, and create pre-formatted forms. Such a system speeds the flow of information during emergency communications. The software has a number of forms built-in including FEMA
The Federal Emergency Management Agency (FEMA) is an agency of the United States Department of Homeland Security (DHS), initially created under President Jimmy Carter by Presidential Reorganization Plan No. 3 of 1978 and implemented by two Ex ...
ICS forms, MARS
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, only being larger than Mercury (planet), Mercury. In the English language, Mars is named for the Mars (mythology), Roman god of war. Mars is a terr ...
reports & messages, Hospital ICS forms, Red Cross
The International Red Cross and Red Crescent Movement is a Humanitarianism, humanitarian movement with approximately 97 million Volunteering, volunteers, members and staff worldwide. It was founded to protect human life and health, to ensure re ...
messages, IARU and NTS messages.
Flwrap
/h2>
Flwrap is a tool for the sending of files using a simplified drag and drop
In computer graphical user interfaces, drag and drop is a pointing device gesture in which the user selects a virtual object by "grabbing" it and dragging it to a different location or onto another virtual object. In general, it can be used to ...
interface. Data compression is available also, which reduces data transfer times.
FLNet
/h2>
FLNet assists net control operators in keeping track of multiple stations during digital amateur radio net
An amateur radio net, or simply ham net, is an " on-the-air" gathering of amateur radio operators. Most nets convene on a regular schedule and specific frequency, and are organized for a particular purpose, such as relaying messages, discussing a ...
s.
FLLog
/h2>
FLLog is a logging software which keeps track of conversations between amateur radio operators in a database format known as ADIF.
FLWkey
/h2>
FLWkey is a simple interface to control an external piece of hardware called
Winkeyer
This is a Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
keyer
A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboar ...
which is adjustable via computer commands over USB
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad ...
.
Flcluster
/h2>
This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.
Flaa
/h2>
Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
CompText
CompTTY
RSID
To identify the mode being transmitted a signal called an RSID, or Reed-Solomon Identifier, can be transmitted before the data. Using this identifier the receiving software can automatically switch to the proper mode for decoding. The assigning of these identifiers to new modes is coordinated to ensure inter-operation between programs.http://www.w1hkj.com/RSID_description.html Currently 7 sound card-digital-modem programs support this standard:
* PocketDigi
* FDMDV
* DM780
* Multipsk
* Fldigi
* AndFlmsg
* TIVAR
RSID operates by sending a short burst of a specific modulation before the data signal, which can be used to automatically identify over 272 digital modes. This burst consists of a 10.766 baud 16-tone MFSK modulation where 15 tones/symbols are sent. The burst occupies 172 Hz of bandwidth and lasts for 1.4 seconds.
Software Architecture
For simple keyboard-to-keyboard communication Fldigi can be operated using just the main window. For more complex uses or file transfer external programs can be attached to the internal TCP/UDP ports 7322 (ARQ), 7342 (KISS), and 7362 (XML-RPC).
The image below helps to illustrate the interconnections and signal-flow within the Fldigi architecture.
Community-provided extensions
Fldigi allows external programs to attach and send / receive data by connecting to port
A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Ham ...
7322/ ARQ or 7342/KISS
A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...
. When used this way, Fldigi and the computer's sound card are acting as a "softmodem
A software modem, commonly referred to as a softmodem, is a modem with minimal hardware that uses software running on the host computer, and the computer's resources (especially the central processing unit, random access memory, and sometimes ...
" allowing text or data sent on one computer to be transferred using the wireless radio link in-between.
Programs which have a history of use with Fldigi as the underlying modem include:
* D-Rats - easy to use chatrooms, email, and file transfer over-radio.
PSKmail
- send and receive on-internet e-mail over a remote radio connection.
Fldigiattach
- attach Fldigi as modem for Linux AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
UIChat
- Java-based amateur radio chat program.
LinkUP
- Program for unattended operation and person to person chat.
* Linux
Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...
- Fldigi can be used in Linux as a KISS (TNC) KISS (Keep It Simple, Stupid) is a protocol for communicating with a serial terminal node controller (TNC) device used for amateur radio. This allows the TNC to combine more features into a single device and standardizes communications. KISS was de ...
modem for AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
Awards and recognitions
* At the 2014 Dayton Hamvention
The Dayton Hamvention is one of the two largest amateur radio convention (or hamfest) in the world. It is held each May in the Dayton, Ohio area and draws attendees from various parts of the world. Since 2017, it has been held at the Greene County ...
the project lead, Dave Freese (W1HKJ), was recognized with the Technical Excellence Award "for his development and distribution of the Fast Light Digital Modem Application (fldigi) family of programs for use in amateur and emergency communications."
* Fldigi was selected as SourceForge's June 2017 Staff 'Project of the Month'
* Fldigi was one of SourceForge's 'Projects of the Week' for Oct 17, 2016
* Fldigi was selected as SourceForge's December 2017 Community Choice 'Project of the Month'
Notable users
Disaster relief services
The software is also utilized by some organizations for both routine and disaster/emergency relief services.
* Multiple state and county emergency operations center
An emergency operations center (EOC) is a central command and control facility responsible for carrying out the principles of emergency preparedness and emergency management, or disaster management functions at a strategic level during an emerg ...
s
* W1AW
W1AW is both the amateur radio call sign and the primary operating station of the American Radio Relay League (ARRL). This station, which is commonly called the Hiram Percy Maxim Memorial Station, is located on the grounds of ARRL Headquarters in ...
(ARRL
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization, and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska o ...
)
* Amateur Radio Emergency Services
In the United States and Canada, the Amateur Radio Emergency Service (ARES) is a corps of trained amateur radio operator volunteers organized to assist in public service and emergency communications. It is organized and sponsored by the Amer ...
(ARES)
* Radio Amateur Civil Emergency Service
The Radio Amateur Civil Emergency Service (RACES) is an emergency radio service authorized in Part 97.407 of the Federal Communications Commission (FCC) rules and regulations governing amateur radio in the United States.Civil Air Patrol
Civil Air Patrol (CAP) is a congressionally chartered, federally supported non-profit corporation that serves as the official civilian auxiliary of the United States Air Force (USAF). CAP is a volunteer organization with an aviation-minded mem ...
(CAP)
* SATERN, the Salvation Army
Salvation (from Latin: ''salvatio'', from ''salva'', 'safe, saved') is the state of being saved or protected from harm or a dire situation. In religion and theology, ''salvation'' generally refers to the deliverance of the soul from sin and its c ...
Team Emergency Radio Network
* SKYWARN
Skywarn (sometimes stylized as SKYWARN) is a program of the National Weather Service (NWS). Its mission is to collect reports of localized severe weather in the United States. These reports are used to aid forecasters in issuing and verifying sev ...
a program of the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
' National Weather Service
The National Weather Service (NWS) is an Government agency, agency of the Federal government of the United States, United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weathe ...
(NWS) whose mission is to collect reports of localized severe weather.
Shortwave broadcasters
Following the successful tests by the Voice of America
Voice of America (VOA or VoA) is the state-owned news network and international radio broadcaster of the United States of America. It is the largest and oldest U.S.-funded international broadcaster. VOA produces digital, TV, and radio content ...
's VOA Radiogram program, international and government shortwave broadcasters began testing and experimenting with digital data over shortwave broadcast channels using the Fldigi software.
These tests led to regular weekly digital broadcasts by the broadcasters listed below.
* VOA Radiogram, service terminated in 2017 and continuing as Shortwave Radiogram.
* In June 2017, following the demise of VOA Radiogram
Shortwave Radiogram
began broadcasting digital data-streams using Fldigi via WRMI
WRMI (Radio Miami International) is a shortwave radio station broadcasting from Okeechobee, Florida, United States. WRMI is a commercial radio station that sells airtime to businesses and organizations.
Programming
WRMI relays several internatio ...
in Miami
Miami ( ), officially the City of Miami, known as "the 305", "The Magic City", and "Gateway to the Americas", is a East Coast of the United States, coastal metropolis and the County seat, county seat of Miami-Dade County, Florida, Miami-Dade C ...
and ''Space Line'
in Bulgaria
Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedon ...
.
* Radio Havana Cuba
Radio Havana Cuba ( es, Radio Habana Cuba, RHC) is the official government-run international broadcasting station of Cuba. It can be heard in many parts of the world including the United States on shortwave frequencies. Radio Havana, along with ...
* Radio Moscow
Radio Moscow ( rus, Pадио Москва, r=Radio Moskva), also known as Radio Moscow World Service, was the official international broadcasting station of the Union of Soviet Socialist Republics until 1993. It was reorganized with a new name ...
* Radio Australia
ABC Radio Australia, also known as Radio Australia, is the international broadcasting and online service operated by the Australian Broadcasting Corporation (ABC), Australia's public broadcaster. Most programming is in English, with some in Tok ...
* Radio Miami International
* Italian Broadcasting Corporation
* WBCQ (SW)
WBCQ is a shortwave radio station operating at Monticello, Maine, United States. The station is owned and operated by Allan Weiner,Ciment, James (2015). Social Issues in America: An Encyclopedia: An Encyclopedia'. Routledge. Retrieved June 27, 201 ...
* Mighty KBC
MARS
The Fldigi suite of programs has become popular within the U.S. Army
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
and U.S. Air Force
The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
Military Auxiliary Radio System
The Military Auxiliary Radio System (MARS) is a United States Department of Defense sponsored program, established as a separately managed and operated program by the United States Army, and the United States Air Force. The United States Navy-M ...
.
Department of Homeland Security
Fldigi is being used in-testing as part of the Department of Homeland Security
The United States Department of Homeland Security (DHS) is the U.S. federal executive department responsible for public security, roughly comparable to the interior or home ministries of other countries. Its stated missions involve anti-terr ...
Shares program, which utilizes "existing HF radio resources of government, critical infrastructure, and disaster response organizations to coordinate and transmit emergency messages"
PSK Mail
Fldigi is used as the underlying modem for th
PSKmail
project. PSK Mail allows users to retrieve and send normal emails over radio.
AirChat
In 2014 the group Anonymous released a communications tool named AirChat, which used Fldigi as the underlying modem. This provided a low speed yet reliable data connection using only moderate radio hardware. The AirChat software allows for anonymous transmissions of both encrypted
In cryptography, encryption is the process of encoding information. This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Ideally, only authorized parties can deci ...
and unencrypted
In cryptography, plaintext usually means unencrypted information pending input into cryptographic algorithms, usually encryption algorithms. This usually refers to data that is transmitted or stored unencrypted.
Overview
With the advent of comp ...
messages over unencrypted channels.
Decodeable broadcasts
The broadcasts listed below are transmitted on a regular schedule and can be decoded using Fldigi.
SITOR text forecasts and storm warnings
WEFAX visual weather fax
* VOA Radiogram Broadcasts
* W1AW Broadcasts
See also
* Amateur Radio
Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communic ...
* Shortwave Radio
Shortwave radio is radio transmission using shortwave (SW) radio frequencies. There is no official definition of the band, but the range always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (100 to 10 me ...
* WSPR (amateur radio software)
WSPR (pronounced "whisper") is an acronym for ''Weak Signal Propagation Reporter''. It is a protocol, implemented in a computer program, used for weak-signal radio communication between amateur radio operators. The protocol was designed, and a ...
* WSJT (amateur radio software)
* CW Skimmer
CW Skimmer is a multi-channel Morse code ( CW) decoder and analyzer program for Microsoft Windows. It was created by Alex Shovkoplyas, VE3NEA, and is marketed by Afreet Software, Inc.
CW Skimmer uses a sensitive CW decoding algorithm based on ...
* Internet Radio Linking Project
The Internet Radio Linking Project, also called IRLP links amateur radio stations around the world by using Voice over IP (VoIP). Each gateway consists of a dedicated computer running custom software that is connected to both a radio and the Inter ...
* PSK31
PSK31 or " Phase Shift Keying, 31 Baud", also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-to-keyboard chat, most often using frequenci ...
* RTTY
Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link. Radioteletype evolved from earlier landline teleprinter o ...
* American Radio Relay League
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization, and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska of ...
References
External links
*
{{Digital modes
Quantized radio modulation modes
Amateur radio software
Amateur radio software for Linux
Amateur radio software for Windows
Free communication software
Amateur radio software for macOS
/h2> Flamp implements the Amateur Multicast Protocol by Dave Freese, W1HKJ and is a tool for connectionless transferring of files to multiple users simultaneously without requiring any existing infrastructure. The program breaks a given file into multiple smaller pieces, checksums each piece, then transmits each piece one or more times. When all parts are correctly received the sent file is re-assembled and can be saved by receiving stations. This program is useful for
multicast
In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast should not be confused with ...
ing files over lossy connections such as those found on high frequency
High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten ...
or during emergency communications.
Flarq
/h2>
Flarq implements the ARQ specification developed by Paul Schmidt, K9PS to transfer emails, text files
A text file (sometimes spelled textfile; an old alternative name is flatfile) is a kind of computer file that is structured as a sequence of lines of electronic text. A text file exists stored as data within a computer file system. In operat ...
, images, and binary file
A binary file is a computer file that is not a text file. The term "binary file" is often used as a term meaning "non-text file". Many binary file formats contain parts that can be interpreted as text; for example, some computer document fil ...
s over radio. This protocol is unicast
Unicast is data transmission from a single sender (red) to a single receiver (green). Other devices on the network (yellow) do not participate in the communication.
In computer networking, unicast is a one-to-one transmission from one point in ...
and connection-based. The software seamlessly integrates with existing email clients such as Microsoft Outlook
Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft Office and Microsoft 365 software suites. Though primarily an email client, Outlook also includes such functions as Calen ...
, Mozilla Thunderbird
Mozilla Thunderbird is a free and open-source cross-platform email client, personal information manager, news client, RSS and chat client developed by the Mozilla Foundation and operated by subsidiary MZLA Technologies Corporation. The projec ...
, and Sylpheed.
Flmsg
/h2>
Flmsg allows users to send, receive, edit, and create pre-formatted forms. Such a system speeds the flow of information during emergency communications. The software has a number of forms built-in including FEMA
The Federal Emergency Management Agency (FEMA) is an agency of the United States Department of Homeland Security (DHS), initially created under President Jimmy Carter by Presidential Reorganization Plan No. 3 of 1978 and implemented by two Ex ...
ICS forms, MARS
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, only being larger than Mercury (planet), Mercury. In the English language, Mars is named for the Mars (mythology), Roman god of war. Mars is a terr ...
reports & messages, Hospital ICS forms, Red Cross
The International Red Cross and Red Crescent Movement is a Humanitarianism, humanitarian movement with approximately 97 million Volunteering, volunteers, members and staff worldwide. It was founded to protect human life and health, to ensure re ...
messages, IARU and NTS messages.
Flwrap
/h2>
Flwrap is a tool for the sending of files using a simplified drag and drop
In computer graphical user interfaces, drag and drop is a pointing device gesture in which the user selects a virtual object by "grabbing" it and dragging it to a different location or onto another virtual object. In general, it can be used to ...
interface. Data compression is available also, which reduces data transfer times.
FLNet
/h2>
FLNet assists net control operators in keeping track of multiple stations during digital amateur radio net
An amateur radio net, or simply ham net, is an " on-the-air" gathering of amateur radio operators. Most nets convene on a regular schedule and specific frequency, and are organized for a particular purpose, such as relaying messages, discussing a ...
s.
FLLog
/h2>
FLLog is a logging software which keeps track of conversations between amateur radio operators in a database format known as ADIF.
FLWkey
/h2>
FLWkey is a simple interface to control an external piece of hardware called
Winkeyer
This is a Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
keyer
A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboar ...
which is adjustable via computer commands over USB
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad ...
.
Flcluster
/h2>
This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.
Flaa
/h2>
Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
CompText
CompTTY
RSID
To identify the mode being transmitted a signal called an RSID, or Reed-Solomon Identifier, can be transmitted before the data. Using this identifier the receiving software can automatically switch to the proper mode for decoding. The assigning of these identifiers to new modes is coordinated to ensure inter-operation between programs.http://www.w1hkj.com/RSID_description.html Currently 7 sound card-digital-modem programs support this standard:
* PocketDigi
* FDMDV
* DM780
* Multipsk
* Fldigi
* AndFlmsg
* TIVAR
RSID operates by sending a short burst of a specific modulation before the data signal, which can be used to automatically identify over 272 digital modes. This burst consists of a 10.766 baud 16-tone MFSK modulation where 15 tones/symbols are sent. The burst occupies 172 Hz of bandwidth and lasts for 1.4 seconds.
Software Architecture
For simple keyboard-to-keyboard communication Fldigi can be operated using just the main window. For more complex uses or file transfer external programs can be attached to the internal TCP/UDP ports 7322 (ARQ), 7342 (KISS), and 7362 (XML-RPC).
The image below helps to illustrate the interconnections and signal-flow within the Fldigi architecture.
Community-provided extensions
Fldigi allows external programs to attach and send / receive data by connecting to port
A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Ham ...
7322/ ARQ or 7342/KISS
A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...
. When used this way, Fldigi and the computer's sound card are acting as a "softmodem
A software modem, commonly referred to as a softmodem, is a modem with minimal hardware that uses software running on the host computer, and the computer's resources (especially the central processing unit, random access memory, and sometimes ...
" allowing text or data sent on one computer to be transferred using the wireless radio link in-between.
Programs which have a history of use with Fldigi as the underlying modem include:
* D-Rats - easy to use chatrooms, email, and file transfer over-radio.
PSKmail
- send and receive on-internet e-mail over a remote radio connection.
Fldigiattach
- attach Fldigi as modem for Linux AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
UIChat
- Java-based amateur radio chat program.
LinkUP
- Program for unattended operation and person to person chat.
* Linux
Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...
- Fldigi can be used in Linux as a KISS (TNC) KISS (Keep It Simple, Stupid) is a protocol for communicating with a serial terminal node controller (TNC) device used for amateur radio. This allows the TNC to combine more features into a single device and standardizes communications. KISS was de ...
modem for AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
Awards and recognitions
* At the 2014 Dayton Hamvention
The Dayton Hamvention is one of the two largest amateur radio convention (or hamfest) in the world. It is held each May in the Dayton, Ohio area and draws attendees from various parts of the world. Since 2017, it has been held at the Greene County ...
the project lead, Dave Freese (W1HKJ), was recognized with the Technical Excellence Award "for his development and distribution of the Fast Light Digital Modem Application (fldigi) family of programs for use in amateur and emergency communications."
* Fldigi was selected as SourceForge's June 2017 Staff 'Project of the Month'
* Fldigi was one of SourceForge's 'Projects of the Week' for Oct 17, 2016
* Fldigi was selected as SourceForge's December 2017 Community Choice 'Project of the Month'
Notable users
Disaster relief services
The software is also utilized by some organizations for both routine and disaster/emergency relief services.
* Multiple state and county emergency operations center
An emergency operations center (EOC) is a central command and control facility responsible for carrying out the principles of emergency preparedness and emergency management, or disaster management functions at a strategic level during an emerg ...
s
* W1AW
W1AW is both the amateur radio call sign and the primary operating station of the American Radio Relay League (ARRL). This station, which is commonly called the Hiram Percy Maxim Memorial Station, is located on the grounds of ARRL Headquarters in ...
(ARRL
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization, and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska o ...
)
* Amateur Radio Emergency Services
In the United States and Canada, the Amateur Radio Emergency Service (ARES) is a corps of trained amateur radio operator volunteers organized to assist in public service and emergency communications. It is organized and sponsored by the Amer ...
(ARES)
* Radio Amateur Civil Emergency Service
The Radio Amateur Civil Emergency Service (RACES) is an emergency radio service authorized in Part 97.407 of the Federal Communications Commission (FCC) rules and regulations governing amateur radio in the United States.Civil Air Patrol
Civil Air Patrol (CAP) is a congressionally chartered, federally supported non-profit corporation that serves as the official civilian auxiliary of the United States Air Force (USAF). CAP is a volunteer organization with an aviation-minded mem ...
(CAP)
* SATERN, the Salvation Army
Salvation (from Latin: ''salvatio'', from ''salva'', 'safe, saved') is the state of being saved or protected from harm or a dire situation. In religion and theology, ''salvation'' generally refers to the deliverance of the soul from sin and its c ...
Team Emergency Radio Network
* SKYWARN
Skywarn (sometimes stylized as SKYWARN) is a program of the National Weather Service (NWS). Its mission is to collect reports of localized severe weather in the United States. These reports are used to aid forecasters in issuing and verifying sev ...
a program of the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
' National Weather Service
The National Weather Service (NWS) is an Government agency, agency of the Federal government of the United States, United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weathe ...
(NWS) whose mission is to collect reports of localized severe weather.
Shortwave broadcasters
Following the successful tests by the Voice of America
Voice of America (VOA or VoA) is the state-owned news network and international radio broadcaster of the United States of America. It is the largest and oldest U.S.-funded international broadcaster. VOA produces digital, TV, and radio content ...
's VOA Radiogram program, international and government shortwave broadcasters began testing and experimenting with digital data over shortwave broadcast channels using the Fldigi software.
These tests led to regular weekly digital broadcasts by the broadcasters listed below.
* VOA Radiogram, service terminated in 2017 and continuing as Shortwave Radiogram.
* In June 2017, following the demise of VOA Radiogram
Shortwave Radiogram
began broadcasting digital data-streams using Fldigi via WRMI
WRMI (Radio Miami International) is a shortwave radio station broadcasting from Okeechobee, Florida, United States. WRMI is a commercial radio station that sells airtime to businesses and organizations.
Programming
WRMI relays several internatio ...
in Miami
Miami ( ), officially the City of Miami, known as "the 305", "The Magic City", and "Gateway to the Americas", is a East Coast of the United States, coastal metropolis and the County seat, county seat of Miami-Dade County, Florida, Miami-Dade C ...
and ''Space Line'
in Bulgaria
Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedon ...
.
* Radio Havana Cuba
Radio Havana Cuba ( es, Radio Habana Cuba, RHC) is the official government-run international broadcasting station of Cuba. It can be heard in many parts of the world including the United States on shortwave frequencies. Radio Havana, along with ...
* Radio Moscow
Radio Moscow ( rus, Pадио Москва, r=Radio Moskva), also known as Radio Moscow World Service, was the official international broadcasting station of the Union of Soviet Socialist Republics until 1993. It was reorganized with a new name ...
* Radio Australia
ABC Radio Australia, also known as Radio Australia, is the international broadcasting and online service operated by the Australian Broadcasting Corporation (ABC), Australia's public broadcaster. Most programming is in English, with some in Tok ...
* Radio Miami International
* Italian Broadcasting Corporation
* WBCQ (SW)
WBCQ is a shortwave radio station operating at Monticello, Maine, United States. The station is owned and operated by Allan Weiner,Ciment, James (2015). Social Issues in America: An Encyclopedia: An Encyclopedia'. Routledge. Retrieved June 27, 201 ...
* Mighty KBC
MARS
The Fldigi suite of programs has become popular within the U.S. Army
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
and U.S. Air Force
The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
Military Auxiliary Radio System
The Military Auxiliary Radio System (MARS) is a United States Department of Defense sponsored program, established as a separately managed and operated program by the United States Army, and the United States Air Force. The United States Navy-M ...
.
Department of Homeland Security
Fldigi is being used in-testing as part of the Department of Homeland Security
The United States Department of Homeland Security (DHS) is the U.S. federal executive department responsible for public security, roughly comparable to the interior or home ministries of other countries. Its stated missions involve anti-terr ...
Shares program, which utilizes "existing HF radio resources of government, critical infrastructure, and disaster response organizations to coordinate and transmit emergency messages"
PSK Mail
Fldigi is used as the underlying modem for th
PSKmail
project. PSK Mail allows users to retrieve and send normal emails over radio.
AirChat
In 2014 the group Anonymous released a communications tool named AirChat, which used Fldigi as the underlying modem. This provided a low speed yet reliable data connection using only moderate radio hardware. The AirChat software allows for anonymous transmissions of both /h2> Flarq implements the ARQ specification developed by Paul Schmidt, K9PS to transfer emails,
text files
A text file (sometimes spelled textfile; an old alternative name is flatfile) is a kind of computer file that is structured as a sequence of lines of electronic text. A text file exists stored as data within a computer file system. In operat ...
, images, and binary file
A binary file is a computer file that is not a text file. The term "binary file" is often used as a term meaning "non-text file". Many binary file formats contain parts that can be interpreted as text; for example, some computer document fil ...
s over radio. This protocol is unicast
Unicast is data transmission from a single sender (red) to a single receiver (green). Other devices on the network (yellow) do not participate in the communication.
In computer networking, unicast is a one-to-one transmission from one point in ...
and connection-based. The software seamlessly integrates with existing email clients such as Microsoft Outlook
Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft Office and Microsoft 365 software suites. Though primarily an email client, Outlook also includes such functions as Calen ...
, Mozilla Thunderbird
Mozilla Thunderbird is a free and open-source cross-platform email client, personal information manager, news client, RSS and chat client developed by the Mozilla Foundation and operated by subsidiary MZLA Technologies Corporation. The projec ...
, and Sylpheed.
Flmsg
/h2>
Flmsg allows users to send, receive, edit, and create pre-formatted forms. Such a system speeds the flow of information during emergency communications. The software has a number of forms built-in including FEMA
The Federal Emergency Management Agency (FEMA) is an agency of the United States Department of Homeland Security (DHS), initially created under President Jimmy Carter by Presidential Reorganization Plan No. 3 of 1978 and implemented by two Ex ...
ICS forms, MARS
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, only being larger than Mercury (planet), Mercury. In the English language, Mars is named for the Mars (mythology), Roman god of war. Mars is a terr ...
reports & messages, Hospital ICS forms, Red Cross
The International Red Cross and Red Crescent Movement is a Humanitarianism, humanitarian movement with approximately 97 million Volunteering, volunteers, members and staff worldwide. It was founded to protect human life and health, to ensure re ...
messages, IARU and NTS messages.
Flwrap
/h2>
Flwrap is a tool for the sending of files using a simplified drag and drop
In computer graphical user interfaces, drag and drop is a pointing device gesture in which the user selects a virtual object by "grabbing" it and dragging it to a different location or onto another virtual object. In general, it can be used to ...
interface. Data compression is available also, which reduces data transfer times.
FLNet
/h2>
FLNet assists net control operators in keeping track of multiple stations during digital amateur radio net
An amateur radio net, or simply ham net, is an " on-the-air" gathering of amateur radio operators. Most nets convene on a regular schedule and specific frequency, and are organized for a particular purpose, such as relaying messages, discussing a ...
s.
FLLog
/h2>
FLLog is a logging software which keeps track of conversations between amateur radio operators in a database format known as ADIF.
FLWkey
/h2>
FLWkey is a simple interface to control an external piece of hardware called
Winkeyer
This is a Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
keyer
A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboar ...
which is adjustable via computer commands over USB
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad ...
.
Flcluster
/h2>
This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.
Flaa
/h2>
Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
CompText
CompTTY
RSID
To identify the mode being transmitted a signal called an RSID, or Reed-Solomon Identifier, can be transmitted before the data. Using this identifier the receiving software can automatically switch to the proper mode for decoding. The assigning of these identifiers to new modes is coordinated to ensure inter-operation between programs.http://www.w1hkj.com/RSID_description.html Currently 7 sound card-digital-modem programs support this standard:
* PocketDigi
* FDMDV
* DM780
* Multipsk
* Fldigi
* AndFlmsg
* TIVAR
RSID operates by sending a short burst of a specific modulation before the data signal, which can be used to automatically identify over 272 digital modes. This burst consists of a 10.766 baud 16-tone MFSK modulation where 15 tones/symbols are sent. The burst occupies 172 Hz of bandwidth and lasts for 1.4 seconds.
Software Architecture
For simple keyboard-to-keyboard communication Fldigi can be operated using just the main window. For more complex uses or file transfer external programs can be attached to the internal TCP/UDP ports 7322 (ARQ), 7342 (KISS), and 7362 (XML-RPC).
The image below helps to illustrate the interconnections and signal-flow within the Fldigi architecture.
Community-provided extensions
Fldigi allows external programs to attach and send / receive data by connecting to port
A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Ham ...
7322/ ARQ or 7342/KISS
A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...
. When used this way, Fldigi and the computer's sound card are acting as a "softmodem
A software modem, commonly referred to as a softmodem, is a modem with minimal hardware that uses software running on the host computer, and the computer's resources (especially the central processing unit, random access memory, and sometimes ...
" allowing text or data sent on one computer to be transferred using the wireless radio link in-between.
Programs which have a history of use with Fldigi as the underlying modem include:
* D-Rats - easy to use chatrooms, email, and file transfer over-radio.
PSKmail
- send and receive on-internet e-mail over a remote radio connection.
Fldigiattach
- attach Fldigi as modem for Linux AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
UIChat
- Java-based amateur radio chat program.
LinkUP
- Program for unattended operation and person to person chat.
* Linux
Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...
- Fldigi can be used in Linux as a KISS (TNC) KISS (Keep It Simple, Stupid) is a protocol for communicating with a serial terminal node controller (TNC) device used for amateur radio. This allows the TNC to combine more features into a single device and standardizes communications. KISS was de ...
modem for AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
Awards and recognitions
* At the 2014 Dayton Hamvention
The Dayton Hamvention is one of the two largest amateur radio convention (or hamfest) in the world. It is held each May in the Dayton, Ohio area and draws attendees from various parts of the world. Since 2017, it has been held at the Greene County ...
the project lead, Dave Freese (W1HKJ), was recognized with the Technical Excellence Award "for his development and distribution of the Fast Light Digital Modem Application (fldigi) family of programs for use in amateur and emergency communications."
* Fldigi was selected as SourceForge's June 2017 Staff 'Project of the Month'
* Fldigi was one of SourceForge's 'Projects of the Week' for Oct 17, 2016
* Fldigi was selected as SourceForge's December 2017 Community Choice 'Project of the Month'
Notable users
Disaster relief services
The software is also utilized by some organizations for both routine and disaster/emergency relief services.
* Multiple state and county emergency operations center
An emergency operations center (EOC) is a central command and control facility responsible for carrying out the principles of emergency preparedness and emergency management, or disaster management functions at a strategic level during an emerg ...
s
* W1AW
W1AW is both the amateur radio call sign and the primary operating station of the American Radio Relay League (ARRL). This station, which is commonly called the Hiram Percy Maxim Memorial Station, is located on the grounds of ARRL Headquarters in ...
(ARRL
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization, and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska o ...
)
* Amateur Radio Emergency Services
In the United States and Canada, the Amateur Radio Emergency Service (ARES) is a corps of trained amateur radio operator volunteers organized to assist in public service and emergency communications. It is organized and sponsored by the Amer ...
(ARES)
* Radio Amateur Civil Emergency Service
The Radio Amateur Civil Emergency Service (RACES) is an emergency radio service authorized in Part 97.407 of the Federal Communications Commission (FCC) rules and regulations governing amateur radio in the United States.Civil Air Patrol
Civil Air Patrol (CAP) is a congressionally chartered, federally supported non-profit corporation that serves as the official civilian auxiliary of the United States Air Force (USAF). CAP is a volunteer organization with an aviation-minded mem ...
(CAP)
* SATERN, the Salvation Army
Salvation (from Latin: ''salvatio'', from ''salva'', 'safe, saved') is the state of being saved or protected from harm or a dire situation. In religion and theology, ''salvation'' generally refers to the deliverance of the soul from sin and its c ...
Team Emergency Radio Network
* SKYWARN
Skywarn (sometimes stylized as SKYWARN) is a program of the National Weather Service (NWS). Its mission is to collect reports of localized severe weather in the United States. These reports are used to aid forecasters in issuing and verifying sev ...
a program of the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
' National Weather Service
The National Weather Service (NWS) is an Government agency, agency of the Federal government of the United States, United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weathe ...
(NWS) whose mission is to collect reports of localized severe weather.
Shortwave broadcasters
Following the successful tests by the Voice of America
Voice of America (VOA or VoA) is the state-owned news network and international radio broadcaster of the United States of America. It is the largest and oldest U.S.-funded international broadcaster. VOA produces digital, TV, and radio content ...
's VOA Radiogram program, international and government shortwave broadcasters began testing and experimenting with digital data over shortwave broadcast channels using the Fldigi software.
These tests led to regular weekly digital broadcasts by the broadcasters listed below.
* VOA Radiogram, service terminated in 2017 and continuing as Shortwave Radiogram.
* In June 2017, following the demise of VOA Radiogram
Shortwave Radiogram
began broadcasting digital data-streams using Fldigi via WRMI
WRMI (Radio Miami International) is a shortwave radio station broadcasting from Okeechobee, Florida, United States. WRMI is a commercial radio station that sells airtime to businesses and organizations.
Programming
WRMI relays several internatio ...
in Miami
Miami ( ), officially the City of Miami, known as "the 305", "The Magic City", and "Gateway to the Americas", is a East Coast of the United States, coastal metropolis and the County seat, county seat of Miami-Dade County, Florida, Miami-Dade C ...
and ''Space Line'
in Bulgaria
Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedon ...
.
* Radio Havana Cuba
Radio Havana Cuba ( es, Radio Habana Cuba, RHC) is the official government-run international broadcasting station of Cuba. It can be heard in many parts of the world including the United States on shortwave frequencies. Radio Havana, along with ...
* Radio Moscow
Radio Moscow ( rus, Pадио Москва, r=Radio Moskva), also known as Radio Moscow World Service, was the official international broadcasting station of the Union of Soviet Socialist Republics until 1993. It was reorganized with a new name ...
* Radio Australia
ABC Radio Australia, also known as Radio Australia, is the international broadcasting and online service operated by the Australian Broadcasting Corporation (ABC), Australia's public broadcaster. Most programming is in English, with some in Tok ...
* Radio Miami International
* Italian Broadcasting Corporation
* WBCQ (SW)
WBCQ is a shortwave radio station operating at Monticello, Maine, United States. The station is owned and operated by Allan Weiner,Ciment, James (2015). Social Issues in America: An Encyclopedia: An Encyclopedia'. Routledge. Retrieved June 27, 201 ...
* Mighty KBC
MARS
The Fldigi suite of programs has become popular within the U.S. Army
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
and U.S. Air Force
The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
Military Auxiliary Radio System
The Military Auxiliary Radio System (MARS) is a United States Department of Defense sponsored program, established as a separately managed and operated program by the United States Army, and the United States Air Force. The United States Navy-M ...
.
Department of Homeland Security
Fldigi is being used in-testing as part of the Department of Homeland Security
The United States Department of Homeland Security (DHS) is the U.S. federal executive department responsible for public security, roughly comparable to the interior or home ministries of other countries. Its stated missions involve anti-terr ...
Shares program, which utilizes "existing HF radio resources of government, critical infrastructure, and disaster response organizations to coordinate and transmit emergency messages"
PSK Mail
Fldigi is used as the underlying modem for th/h2> Flmsg allows users to send, receive, edit, and create pre-formatted forms. Such a system speeds the flow of information during emergency communications. The software has a number of forms built-in including
FEMA
The Federal Emergency Management Agency (FEMA) is an agency of the United States Department of Homeland Security (DHS), initially created under President Jimmy Carter by Presidential Reorganization Plan No. 3 of 1978 and implemented by two Ex ...
ICS forms, MARS
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, only being larger than Mercury (planet), Mercury. In the English language, Mars is named for the Mars (mythology), Roman god of war. Mars is a terr ...
reports & messages, Hospital ICS forms, Red Cross
The International Red Cross and Red Crescent Movement is a Humanitarianism, humanitarian movement with approximately 97 million Volunteering, volunteers, members and staff worldwide. It was founded to protect human life and health, to ensure re ...
messages, IARU and NTS messages.
Flwrap
/h2>
Flwrap is a tool for the sending of files using a simplified drag and drop
In computer graphical user interfaces, drag and drop is a pointing device gesture in which the user selects a virtual object by "grabbing" it and dragging it to a different location or onto another virtual object. In general, it can be used to ...
interface. Data compression is available also, which reduces data transfer times.
FLNet
/h2>
FLNet assists net control operators in keeping track of multiple stations during digital amateur radio net
An amateur radio net, or simply ham net, is an " on-the-air" gathering of amateur radio operators. Most nets convene on a regular schedule and specific frequency, and are organized for a particular purpose, such as relaying messages, discussing a ...
s.
FLLog
/h2>
FLLog is a logging software which keeps track of conversations between amateur radio operators in a database format known as ADIF.
FLWkey
/h2>
FLWkey is a simple interface to control an external piece of hardware called
Winkeyer
This is a Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
keyer
A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboar ...
which is adjustable via computer commands over USB
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad ...
.
Flcluster
/h2>
This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.
Flaa
/h2>
Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
CompText
CompTTY
RSID
To identify the mode being transmitted a signal called an RSID, or Reed-Solomon Identifier, can be transmitted before the data. Using this identifier the receiving software can automatically switch to the proper mode for decoding. The assigning of these identifiers to new modes is coordinated to ensure inter-operation between programs.http://www.w1hkj.com/RSID_description.html Currently 7 sound card-digital-modem programs support this standard:
* PocketDigi
* FDMDV
* DM780
* Multipsk
* Fldigi
* AndFlmsg
* TIVAR
RSID operates by sending a short burst of a specific modulation before the data signal, which can be used to automatically identify over 272 digital modes. This burst consists of a 10.766 baud 16-tone MFSK modulation where 15 tones/symbols are sent. The burst occupies 172 Hz of bandwidth and lasts for 1.4 seconds.
Software Architecture
For simple keyboard-to-keyboard communication Fldigi can be operated using just the main window. For more complex uses or file transfer external programs can be attached to the internal TCP/UDP ports 7322 (ARQ), 7342 (KISS), and 7362 (XML-RPC).
The image below helps to illustrate the interconnections and signal-flow within the Fldigi architecture.
Community-provided extensions
Fldigi allows external programs to attach and send / receive data by connecting to port
A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Ham ...
7322/ ARQ or 7342/KISS
A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...
. When used this way, Fldigi and the computer's sound card are acting as a "softmodem
A software modem, commonly referred to as a softmodem, is a modem with minimal hardware that uses software running on the host computer, and the computer's resources (especially the central processing unit, random access memory, and sometimes ...
" allowing text or data sent on one computer to be transferred using the wireless radio link in-between.
Programs which have a history of use with Fldigi as the underlying modem include:
* D-Rats - easy to use chatrooms, email, and file transfer over-radio.
PSKmail
- send and receive on-internet e-mail over a remote radio connection.
Fldigiattach
- attach Fldigi as modem for Linux AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
UIChat
- Java-based amateur radio chat program.
LinkUP
- Program for unattended operation and person to person chat.
* Linux
Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...
- Fldigi can be used in Linux as a KISS (TNC) KISS (Keep It Simple, Stupid) is a protocol for communicating with a serial terminal node controller (TNC) device used for amateur radio. This allows the TNC to combine more features into a single device and standardizes communications. KISS was de ...
modem for AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
Awards and recognitions
* At the 2014 Dayton Hamvention
The Dayton Hamvention is one of the two largest amateur radio convention (or hamfest) in the world. It is held each May in the Dayton, Ohio area and draws attendees from various parts of the world. Since 2017, it has been held at the Greene County ...
the project lead, Dave Freese (W1HKJ), was recognized with the Technical Excellence Award "for his development and distribution of the Fast Light Digital Modem Application (fldigi) family of programs for use in amateur and emergency communications."
* Fldigi was selected as SourceForge's June 2017 Staff 'Project of the Month'
* Fldigi was one of SourceForge's 'Projects of the Week' for Oct 17, 2016
* Fldigi was selected as SourceForge's December 2017 Community Choice 'Project of the Month'
Notable users
Disaster relief services
The software is also utilized by some organizations for both routine and disaster/emergency relief services.
* Multiple state and county emergency operations center
An emergency operations center (EOC) is a central command and control facility responsible for carrying out the principles of emergency preparedness and emergency management, or disaster management functions at a strategic level during an emerg ...
s
* W1AW
W1AW is both the amateur radio call sign and the primary operating station of the American Radio Relay League (ARRL). This station, which is commonly called the Hiram Percy Maxim Memorial Station, is located on the grounds of ARRL Headquarters in ...
(ARRL
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization, and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska o ...
)
* Amateur Radio Emergency Services
In the United States and Canada, the Amateur Radio Emergency Service (ARES) is a corps of trained amateur radio operator volunteers organized to assist in public service and emergency communications. It is organized and sponsored by the Amer ...
(ARES)
* Radio Amateur Civil Emergency Service
The Radio Amateur Civil Emergency Service (RACES) is an emergency radio service authorized in Part 97.407 of the Federal Communications Commission (FCC) rules and regulations governing amateur radio in the United States.Civil Air Patrol
Civil Air Patrol (CAP) is a congressionally chartered, federally supported non-profit corporation that serves as the official civilian auxiliary of the United States Air Force (USAF). CAP is a volunteer organization with an aviation-minded mem ...
(CAP)
* SATERN, the Salvation Army
Salvation (from Latin: ''salvatio'', from ''salva'', 'safe, saved') is the state of being saved or protected from harm or a dire situation. In religion and theology, ''salvation'' generally refers to the deliverance of the soul from sin and its c ...
Team Emergency Radio Network
* SKYWARN
Skywarn (sometimes stylized as SKYWARN) is a program of the National Weather Service (NWS). Its mission is to collect reports of localized severe weather in the United States. These reports are used to aid forecasters in issuing and verifying sev ...
a program of the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
' National Weather Service
The National Weather Service (NWS) is an Government agency, agency of the Federal government of the United States, United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weathe ...
(NWS) whose mission is to collect reports of localized severe weather.
Shortwave broadcasters
Following the successful tests by the Voice of America
Voice of America (VOA or VoA) is the state-owned news network and international radio broadcaster of the United States of America. It is the largest and oldest U.S.-funded international broadcaster. VOA produces digital, TV, and radio content ...
's VOA Radiogram program, international and government shortwave broadcasters began testing and experimenting with digital data over shortwave broadcast channels using the Fldigi software.
These tests led to regular weekly digital broadcasts by the broadcasters listed below.
* VOA Radiogram, service terminated in 2017 and continuing as Shortwave Radiogram.
* In June 2017, following the demise of VOA Radiogram
Shortwave Radiogram
began broadcasting digital data-streams using Fldigi via WRMI
WRMI (Radio Miami International) is a shortwave radio station broadcasting from Okeechobee, Florida, United States. WRMI is a commercial radio station that sells airtime to businesses and organizations.
Programming
WRMI relays several internatio ...
in Miami
Miami ( ), officially the City of Miami, known as "the 305", "The Magic City", and "Gateway to the Americas", is a East Coast of the United States, coastal metropolis and the County seat, county seat of Miami-Dade County, Florida, Miami-Dade C ...
and ''Space Line'
in Bulgaria
Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedon ...
.
* Radio Havana Cuba
Radio Havana Cuba ( es, Radio Habana Cuba, RHC) is the official government-run international broadcasting station of Cuba. It can be heard in many parts of the world including the United States on shortwave frequencies. Radio Havana, along with ...
* Radio Moscow
Radio Moscow ( rus, Pадио Москва, r=Radio Moskva), also known as Radio Moscow World Service, was the official international broadcasting station of the Union of Soviet Socialist Republics until 1993. It was reorganized with a new name ...
* Radio Australia
ABC Radio Australia, also known as Radio Australia, is the international broadcasting and online service operated by the Australian Broadcasting Corporation (ABC), Australia's public broadcaster. Most programming is in English, with some in Tok ...
* Radio Miami International
* Italian Broadcasting Corporation
* WBCQ (SW)
WBCQ is a shortwave radio station operating at Monticello, Maine, United States. The station is owned and operated by Allan Weiner,Ciment, James (2015). Social Issues in America: An Encyclopedia: An Encyclopedia'. Routledge. Retrieved June 27, 201 ...
* Mighty KBC
MARS
The Fldigi suite of programs has become popular within the U.S. Army
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
and U.S. Air Force
The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
Military Auxiliary Radio System
The Military Auxiliary Radio System (MARS) is a United States Department of Defense sponsored program, established as a separately managed and operated program by the United States Army, and the United States Air Force. The United States Navy-M ...
.
Department of Homeland Security
Fldigi is being used in-testing as part of the /h2> Flwrap is a tool for the sending of files using a simplified
drag and drop
In computer graphical user interfaces, drag and drop is a pointing device gesture in which the user selects a virtual object by "grabbing" it and dragging it to a different location or onto another virtual object. In general, it can be used to ...
interface. Data compression is available also, which reduces data transfer times.
FLNet
/h2>
FLNet assists net control operators in keeping track of multiple stations during digital amateur radio net
An amateur radio net, or simply ham net, is an " on-the-air" gathering of amateur radio operators. Most nets convene on a regular schedule and specific frequency, and are organized for a particular purpose, such as relaying messages, discussing a ...
s.
FLLog
/h2>
FLLog is a logging software which keeps track of conversations between amateur radio operators in a database format known as ADIF.
FLWkey
/h2>
FLWkey is a simple interface to control an external piece of hardware called
Winkeyer
This is a Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
keyer
A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboar ...
which is adjustable via computer commands over USB
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad ...
.
Flcluster
/h2>
This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.
Flaa
/h2>
Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
CompText
CompTTY
RSID
To identify the mode being transmitted a signal called an RSID, or Reed-Solomon Identifier, can be transmitted before the data. Using this identifier the receiving software can automatically switch to the proper mode for decoding. The assigning of these identifiers to new modes is coordinated to ensure inter-operation between programs.http://www.w1hkj.com/RSID_description.html Currently 7 sound card-digital-modem programs support this standard:
* PocketDigi
* FDMDV
* DM780
* Multipsk
* Fldigi
* AndFlmsg
* TIVAR
RSID operates by sending a short burst of a specific modulation before the data signal, which can be used to automatically identify over 272 digital modes. This burst consists of a 10.766 baud 16-tone MFSK modulation where 15 tones/symbols are sent. The burst occupies 172 Hz of bandwidth and lasts for 1.4 seconds.
Software Architecture
For simple keyboard-to-keyboard communication Fldigi can be operated using just the main window. For more complex uses or file transfer external programs can be attached to the internal TCP/UDP ports 7322 (ARQ), 7342 (KISS), and 7362 (XML-RPC).
The image below helps to illustrate the interconnections and signal-flow within the Fldigi architecture.
Community-provided extensions
Fldigi allows external programs to attach and send / receive data by connecting to port
A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Ham ...
7322/ ARQ or 7342/KISS
A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...
. When used this way, Fldigi and the computer's sound card are acting as a "softmodem
A software modem, commonly referred to as a softmodem, is a modem with minimal hardware that uses software running on the host computer, and the computer's resources (especially the central processing unit, random access memory, and sometimes ...
" allowing text or data sent on one computer to be transferred using the wireless radio link in-between.
Programs which have a history of use with Fldigi as the underlying modem include:
* D-Rats - easy to use chatrooms, email, and file transfer over-radio.
PSKmail
- send and receive on-internet e-mail over a remote radio connection.
Fldigiattach
- attach Fldigi as modem for Linux AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
UIChat
- Java-based amateur radio chat program.
LinkUP
- Program for unattended operation and person to person chat.
* Linux
Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...
- Fldigi can be used in Linux as a KISS (TNC) KISS (Keep It Simple, Stupid) is a protocol for communicating with a serial terminal node controller (TNC) device used for amateur radio. This allows the TNC to combine more features into a single device and standardizes communications. KISS was de ...
modem for AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
Awards and recognitions
* At the 2014 Dayton Hamvention
The Dayton Hamvention is one of the two largest amateur radio convention (or hamfest) in the world. It is held each May in the Dayton, Ohio area and draws attendees from various parts of the world. Since 2017, it has been held at the Greene County ...
the project lead, Dave Freese (W1HKJ), was recognized with the Technical Excellence Award "for his development and distribution of the Fast Light Digital Modem Application (fldigi) family of programs for use in amateur and emergency communications."
* Fldigi was selected as SourceForge's June 2017 Staff 'Project of the Month'
* Fldigi was one of SourceForge's 'Projects of the Week' for Oct 17, 2016
* Fldigi was selected as SourceForge's December 2017 Community Choice 'Project of the Month'
Notable users
Disaster relief services
The software is also utilized by some organizations for both routine and disaster/emergency relief services.
* Multiple state and county emergency operations center
An emergency operations center (EOC) is a central command and control facility responsible for carrying out the principles of emergency preparedness and emergency management, or disaster management functions at a strategic level during an emerg ...
s
* W1AW
W1AW is both the amateur radio call sign and the primary operating station of the American Radio Relay League (ARRL). This station, which is commonly called the Hiram Percy Maxim Memorial Station, is located on the grounds of ARRL Headquarters in ...
(ARRL
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization, and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska o ...
)
* Amateur Radio Emergency Services
In the United States and Canada, the Amateur Radio Emergency Service (ARES) is a corps of trained amateur radio operator volunteers organized to assist in public service and emergency communications. It is organized and sponsored by the Amer ...
(ARES)
* Radio Amateur Civil Emergency Service
The Radio Amateur Civil Emergency Service (RACES) is an emergency radio service authorized in Part 97.407 of the Federal Communications Commission (FCC) rules and regulations governing amateur radio in the United States.Civil Air Patrol
Civil Air Patrol (CAP) is a congressionally chartered, federally supported non-profit corporation that serves as the official civilian auxiliary of the United States Air Force (USAF). CAP is a volunteer organization with an aviation-minded mem ...
(CAP)
* SATERN, the Salvation Army
Salvation (from Latin: ''salvatio'', from ''salva'', 'safe, saved') is the state of being saved or protected from harm or a dire situation. In religion and theology, ''salvation'' generally refers to the deliverance of the soul from sin and its c ...
Team Emergency Radio Network
* SKYWARN
Skywarn (sometimes stylized as SKYWARN) is a program of the National Weather Service (NWS). Its mission is to collect reports of localized severe weather in the United States. These reports are used to aid forecasters in issuing and verifying sev ...
a program of the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
' National Weather Service
The National Weather Service (NWS) is an Government agency, agency of the Federal government of the United States, United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weathe ...
(NWS) whose mission is to collect reports of localized severe weather.
Shortwave broadcasters
Following the successful tests by the Voice of America
Voice of America (VOA or VoA) is the state-owned news network and international radio broadcaster of the United States of America. It is the largest and oldest U.S.-funded international broadcaster. VOA produces digital, TV, and radio content ...
's VOA Radiogram program, international and government shortwave broadcasters began testing and experimenting with digital data over shortwave broadcast channels using the Fldigi software.
These tests led to regular weekly digital broadcasts by the broadcasters listed below.
* VOA Radiogram, service terminated in 2017 and continuing as Shortwave Radiogram.
* In June 2017, following the demise of VOA Radiogram
Shortwave Radiogram
began broadcasting digital data-streams using Fldigi via WRMI
WRMI (Radio Miami International) is a shortwave radio station broadcasting from Okeechobee, Florida, United States. WRMI is a commercial radio station that sells airtime to businesses and organizations.
Programming
WRMI relays several internatio ...
in Miami
Miami ( ), officially the City of Miami, known as "the 305", "The Magic City", and "Gateway to the Americas", is a East Coast of the United States, coastal metropolis and the County seat, county seat of Miami-Dade County, Florida, Miami-Dade C ...
and ''Space Line'
in Bulgaria
Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedon ...
.
* Radio Havana Cuba
Radio Havana Cuba ( es, Radio Habana Cuba, RHC) is the official government-run international broadcasting station of Cuba. It can be heard in many parts of the world including the United States on shortwave frequencies. Radio Havana, along with ...
* Radio Moscow
Radio Moscow ( rus, Pадио Москва, r=Radio Moskva), also known as Radio Moscow World Service, was the official international broadcasting station of the Union of Soviet Socialist Republics until 1993. It was reorganized with a new name ...
* Radio Australia
ABC Radio Australia, also known as Radio Australia, is the international broadcasting and online service operated by the Australian Broadcasting Corporation (ABC), Australia's public broadcaster. Most programming is in English, with some in Tok ...
* Radio Miami International
* Italian Broadcasting Corporation
* WBCQ (SW)
WBCQ is a shortwave radio station operating at Monticello, Maine, United States. The station is owned and operated by Allan Weiner,Ciment, James (2015). Social Issues in America: An Encyclopedia: An Encyclopedia'. Routledge. Retrieved June 27, 201 ...
* Mighty KBC
MARS
The Fldigi suite of programs has become popular within the /h2> FLNet assists net control operators in keeping track of multiple stations during digital
amateur radio net
An amateur radio net, or simply ham net, is an " on-the-air" gathering of amateur radio operators. Most nets convene on a regular schedule and specific frequency, and are organized for a particular purpose, such as relaying messages, discussing a ...
s.
FLLog
/h2>
FLLog is a logging software which keeps track of conversations between amateur radio operators in a database format known as ADIF.
FLWkey
/h2>
FLWkey is a simple interface to control an external piece of hardware called
Winkeyer
This is a Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
keyer
A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboar ...
which is adjustable via computer commands over USB
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad ...
.
Flcluster
/h2>
This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.
Flaa
/h2>
Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
CompText
CompTTY
RSID
To identify the mode being transmitted a signal called an RSID, or Reed-Solomon Identifier, can be transmitted before the data. Using this identifier the receiving software can automatically switch to the proper mode for decoding. The assigning of these identifiers to new modes is coordinated to ensure inter-operation between programs.http://www.w1hkj.com/RSID_description.html Currently 7 sound card-digital-modem programs support this standard:
* PocketDigi
* FDMDV
* DM780
* Multipsk
* Fldigi
* AndFlmsg
* TIVAR
RSID operates by sending a short burst of a specific modulation before the data signal, which can be used to automatically identify over 272 digital modes. This burst consists of a 10.766 baud 16-tone MFSK modulation where 15 tones/symbols are sent. The burst occupies 172 Hz of bandwidth and lasts for 1.4 seconds.
Software Architecture
For simple keyboard-to-keyboard communication Fldigi can be operated using just the main window. For more complex uses or file transfer external programs can be attached to the internal TCP/UDP ports 7322 (ARQ), 7342 (KISS), and 7362 (XML-RPC).
The image below helps to illustrate the interconnections and signal-flow within the Fldigi architecture.
Community-provided extensions
Fldigi allows external programs to attach and send / receive data by connecting to port
A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Ham ...
7322/ ARQ or 7342/KISS
A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...
. When used this way, Fldigi and the computer's sound card are acting as a "softmodem
A software modem, commonly referred to as a softmodem, is a modem with minimal hardware that uses software running on the host computer, and the computer's resources (especially the central processing unit, random access memory, and sometimes ...
" allowing text or data sent on one computer to be transferred using the wireless radio link in-between.
Programs which have a history of use with Fldigi as the underlying modem include:
* D-Rats - easy to use chatrooms, email, and file transfer over-radio.
PSKmail
- send and receive on-internet e-mail over a remote radio connection.
Fldigiattach
- attach Fldigi as modem for Linux AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
UIChat
- Java-based amateur radio chat program.
LinkUP
- Program for unattended operation and person to person chat.
* Linux
Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...
- Fldigi can be used in Linux as a KISS (TNC) KISS (Keep It Simple, Stupid) is a protocol for communicating with a serial terminal node controller (TNC) device used for amateur radio. This allows the TNC to combine more features into a single device and standardizes communications. KISS was de ...
modem for AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
Awards and recognitions
* At the 2014 Dayton Hamvention
The Dayton Hamvention is one of the two largest amateur radio convention (or hamfest) in the world. It is held each May in the Dayton, Ohio area and draws attendees from various parts of the world. Since 2017, it has been held at the Greene County ...
the project lead, Dave Freese (W1HKJ), was recognized with the Technical Excellence Award "for his development and distribution of the Fast Light Digital Modem Application (fldigi) family of programs for use in amateur and emergency communications."
* Fldigi was selected as SourceForge's June 2017 Staff 'Project of the Month'
* Fldigi was one of SourceForge's 'Projects of the Week' for Oct 17, 2016
* Fldigi was selected as SourceForge's December 2017 Community Choice 'Project of the Month'
Notable users
Disaster relief services
The software is also utilized by some organizations for both routine and disaster/emergency relief services.
* Multiple state and county emergency operations center
An emergency operations center (EOC) is a central command and control facility responsible for carrying out the principles of emergency preparedness and emergency management, or disaster management functions at a strategic level during an emerg ...
s
* W1AW
W1AW is both the amateur radio call sign and the primary operating station of the American Radio Relay League (ARRL). This station, which is commonly called the Hiram Percy Maxim Memorial Station, is located on the grounds of ARRL Headquarters in ...
(ARRL
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization, and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska o ...
)
* Amateur Radio Emergency Services
In the United States and Canada, the Amateur Radio Emergency Service (ARES) is a corps of trained amateur radio operator volunteers organized to assist in public service and emergency communications. It is organized and sponsored by the Amer ...
(ARES)
* Radio Amateur Civil Emergency Service
The Radio Amateur Civil Emergency Service (RACES) is an emergency radio service authorized in Part 97.407 of the Federal Communications Commission (FCC) rules and regulations governing amateur radio in the United States.Civil Air Patrol
Civil Air Patrol (CAP) is a congressionally chartered, federally supported non-profit corporation that serves as the official civilian auxiliary of the United States Air Force (USAF). CAP is a volunteer organization with an aviation-minded mem ...
(CAP)
* SATERN, the Salvation Army
Salvation (from Latin: ''salvatio'', from ''salva'', 'safe, saved') is the state of being saved or protected from harm or a dire situation. In religion and theology, ''salvation'' generally refers to the deliverance of the soul from sin and its c ...
Team Emergency Radio Network
* SKYWARN
Skywarn (sometimes stylized as SKYWARN) is a program of the National Weather Service (NWS). Its mission is to collect reports of localized severe weather in the United States. These reports are used to aid forecasters in issuing and verifying sev ...
a program of the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
' National Weather Service
The National Weather Service (NWS) is an Government agency, agency of the Federal government of the United States, United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weathe ...
(NWS) whose mission is to collect reports of localized severe weather.
Shortwave broadcasters
Following the successful tests by the /h2> FLLog is a logging software which keeps track of conversations between amateur radio operators in a database format known as ADIF.
FLWkey
/h2>
FLWkey is a simple interface to control an external piece of hardware called
Winkeyer
This is a Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
keyer
A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboar ...
which is adjustable via computer commands over USB
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad ...
.
Flcluster
/h2>
This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.
Flaa
/h2>
Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
CompText
CompTTY
RSID
To identify the mode being transmitted a signal called an RSID, or Reed-Solomon Identifier, can be transmitted before the data. Using this identifier the receiving software can automatically switch to the proper mode for decoding. The assigning of these identifiers to new modes is coordinated to ensure inter-operation between programs.http://www.w1hkj.com/RSID_description.html Currently 7 sound card-digital-modem programs support this standard:
* PocketDigi
* FDMDV
* DM780
* Multipsk
* Fldigi
* AndFlmsg
* TIVAR
RSID operates by sending a short burst of a specific modulation before the data signal, which can be used to automatically identify over 272 digital modes. This burst consists of a 10.766 baud 16-tone MFSK modulation where 15 tones/symbols are sent. The burst occupies 172 Hz of bandwidth and lasts for 1.4 seconds.
Software Architecture
For simple keyboard-to-keyboard communication Fldigi can be operated using just the main window. For more complex uses or file transfer external programs can be attached to the internal TCP/UDP ports 7322 (ARQ), 7342 (KISS), and 7362 (XML-RPC).
The image below helps to illustrate the interconnections and signal-flow within the Fldigi architecture.
Community-provided extensions
Fldigi allows external programs to attach and send / receive data by connecting to port
A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Ham ...
7322/ ARQ or 7342/KISS
A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...
. When used this way, Fldigi and the computer's sound card are acting as a "softmodem
A software modem, commonly referred to as a softmodem, is a modem with minimal hardware that uses software running on the host computer, and the computer's resources (especially the central processing unit, random access memory, and sometimes ...
" allowing text or data sent on one computer to be transferred using the wireless radio link in-between.
Programs which have a history of use with Fldigi as the underlying modem include:
* D-Rats - easy to use chatrooms, email, and file transfer over-radio.
PSKmail
- send and receive on-internet e-mail over a remote radio connection.
Fldigiattach
- attach Fldigi as modem for Linux AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
UIChat
- Java-based amateur radio chat program.
LinkUP
- Program for unattended operation and person to person chat.
* Linux
Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...
- Fldigi can be used in Linux as a KISS (TNC) KISS (Keep It Simple, Stupid) is a protocol for communicating with a serial terminal node controller (TNC) device used for amateur radio. This allows the TNC to combine more features into a single device and standardizes communications. KISS was de ...
modem for AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
Awards and recognitions
* At the 2014 Dayton Hamvention
The Dayton Hamvention is one of the two largest amateur radio convention (or hamfest) in the world. It is held each May in the Dayton, Ohio area and draws attendees from various parts of the world. Since 2017, it has been held at the Greene County ...
the project lead, Dave Freese (W1HKJ), was recognized with the Technical Excellence Award "for his development and distribution of the Fast Light Digital Modem Application (fldigi) family of programs for use in amateur and emergency communications."
* Fldigi was selected as SourceForge's June 2017 Staff 'Project of the Month'
* Fldigi was one of SourceForge's 'Projects of the Week' for Oct 17, 2016
* Fldigi was selected as SourceForge's December 2017 Community Choice 'Project of the Month'
Notable users
Disaster relief services
The software is also utilized by some organizations for both routine and disaster/emergency relief services.
* Multiple state and county /h2> FLWkey is a simple interface to control an external piece of hardware called
Winkeyer
This is a
Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
keyer
A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboar ...
which is adjustable via computer commands over USB
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad ...
.
Flcluster
/h2>
This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.
Flaa
/h2>
Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
CompText
CompTTY
/h2> This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.
Flaa
/h2>
Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
CompText
/h2> Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.
Flrig
/h2>
FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection.
Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.
LinSim
/h2> FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection. Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.
Test tools
The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi.LinSim
CompText
CompTTY
RSID
To identify the mode being transmitted a signal called an RSID, or Reed-Solomon Identifier, can be transmitted before the data. Using this identifier the receiving software can automatically switch to the proper mode for decoding. The assigning of these identifiers to new modes is coordinated to ensure inter-operation between programs.http://www.w1hkj.com/RSID_description.html Currently 7 sound card-digital-modem programs support this standard: * PocketDigi * FDMDV * DM780 * Multipsk * Fldigi * AndFlmsg * TIVAR RSID operates by sending a short burst of a specific modulation before the data signal, which can be used to automatically identify over 272 digital modes. This burst consists of a 10.766 baud 16-tone MFSK modulation where 15 tones/symbols are sent. The burst occupies 172 Hz of bandwidth and lasts for 1.4 seconds.Software Architecture
For simple keyboard-to-keyboard communication Fldigi can be operated using just the main window. For more complex uses or file transfer external programs can be attached to the internal TCP/UDP ports 7322 (ARQ), 7342 (KISS), and 7362 (XML-RPC). The image below helps to illustrate the interconnections and signal-flow within the Fldigi architecture.
Community-provided extensions
Fldigi allows external programs to attach and send / receive data by connecting toport
A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Ham ...
7322/ ARQ or 7342/KISS
A kiss is the touch or pressing of one's lips against another person or an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, romance, sexual attraction, ...
. When used this way, Fldigi and the computer's sound card are acting as a "softmodem
A software modem, commonly referred to as a softmodem, is a modem with minimal hardware that uses software running on the host computer, and the computer's resources (especially the central processing unit, random access memory, and sometimes ...
" allowing text or data sent on one computer to be transferred using the wireless radio link in-between.
Programs which have a history of use with Fldigi as the underlying modem include:
* D-Rats - easy to use chatrooms, email, and file transfer over-radio.
PSKmail
- send and receive on-internet e-mail over a remote radio connection.
Fldigiattach
- attach Fldigi as modem for Linux
AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
UIChat
- Java-based amateur radio chat program.
LinkUP
- Program for unattended operation and person to person chat. *
Linux
Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...
- Fldigi can be used in Linux as a KISS (TNC) KISS (Keep It Simple, Stupid) is a protocol for communicating with a serial terminal node controller (TNC) device used for amateur radio. This allows the TNC to combine more features into a single device and standardizes communications. KISS was de ...
modem for AX.25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks.
AX.25 v2.0 and later occupies t ...
and TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
connections.
Awards and recognitions
* At the 2014Dayton Hamvention
The Dayton Hamvention is one of the two largest amateur radio convention (or hamfest) in the world. It is held each May in the Dayton, Ohio area and draws attendees from various parts of the world. Since 2017, it has been held at the Greene County ...
the project lead, Dave Freese (W1HKJ), was recognized with the Technical Excellence Award "for his development and distribution of the Fast Light Digital Modem Application (fldigi) family of programs for use in amateur and emergency communications."
* Fldigi was selected as SourceForge's June 2017 Staff 'Project of the Month'
* Fldigi was one of SourceForge's 'Projects of the Week' for Oct 17, 2016
* Fldigi was selected as SourceForge's December 2017 Community Choice 'Project of the Month'
Notable users
Disaster relief services
emergency operations center
An emergency operations center (EOC) is a central command and control facility responsible for carrying out the principles of emergency preparedness and emergency management, or disaster management functions at a strategic level during an emerg ...
s
* W1AW
W1AW is both the amateur radio call sign and the primary operating station of the American Radio Relay League (ARRL). This station, which is commonly called the Hiram Percy Maxim Memorial Station, is located on the grounds of ARRL Headquarters in ...
(ARRL
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization, and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska o ...
)
* Amateur Radio Emergency Services
In the United States and Canada, the Amateur Radio Emergency Service (ARES) is a corps of trained amateur radio operator volunteers organized to assist in public service and emergency communications. It is organized and sponsored by the Amer ...
(ARES)
* Radio Amateur Civil Emergency Service
The Radio Amateur Civil Emergency Service (RACES) is an emergency radio service authorized in Part 97.407 of the Federal Communications Commission (FCC) rules and regulations governing amateur radio in the United States.Civil Air Patrol
Civil Air Patrol (CAP) is a congressionally chartered, federally supported non-profit corporation that serves as the official civilian auxiliary of the United States Air Force (USAF). CAP is a volunteer organization with an aviation-minded mem ...
(CAP)
* SATERN, the Salvation Army
Salvation (from Latin: ''salvatio'', from ''salva'', 'safe, saved') is the state of being saved or protected from harm or a dire situation. In religion and theology, ''salvation'' generally refers to the deliverance of the soul from sin and its c ...
Team Emergency Radio Network
* SKYWARN
Skywarn (sometimes stylized as SKYWARN) is a program of the National Weather Service (NWS). Its mission is to collect reports of localized severe weather in the United States. These reports are used to aid forecasters in issuing and verifying sev ...
a program of the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
' National Weather Service
The National Weather Service (NWS) is an Government agency, agency of the Federal government of the United States, United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weathe ...
(NWS) whose mission is to collect reports of localized severe weather.
Shortwave broadcasters
Voice of America
Voice of America (VOA or VoA) is the state-owned news network and international radio broadcaster of the United States of America. It is the largest and oldest U.S.-funded international broadcaster. VOA produces digital, TV, and radio content ...
's VOA Radiogram program, international and government shortwave broadcasters began testing and experimenting with digital data over shortwave broadcast channels using the Fldigi software.
These tests led to regular weekly digital broadcasts by the broadcasters listed below.
* VOA Radiogram, service terminated in 2017 and continuing as Shortwave Radiogram.
* In June 2017, following the demise of VOA RadiogramShortwave Radiogram
began broadcasting digital data-streams using Fldigi via
WRMI
WRMI (Radio Miami International) is a shortwave radio station broadcasting from Okeechobee, Florida, United States. WRMI is a commercial radio station that sells airtime to businesses and organizations.
Programming
WRMI relays several internatio ...
in Miami
Miami ( ), officially the City of Miami, known as "the 305", "The Magic City", and "Gateway to the Americas", is a East Coast of the United States, coastal metropolis and the County seat, county seat of Miami-Dade County, Florida, Miami-Dade C ...
and ''Space Line'in
Bulgaria
Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedon ...
.
* Radio Havana Cuba
Radio Havana Cuba ( es, Radio Habana Cuba, RHC) is the official government-run international broadcasting station of Cuba. It can be heard in many parts of the world including the United States on shortwave frequencies. Radio Havana, along with ...
* Radio Moscow
Radio Moscow ( rus, Pадио Москва, r=Radio Moskva), also known as Radio Moscow World Service, was the official international broadcasting station of the Union of Soviet Socialist Republics until 1993. It was reorganized with a new name ...
* Radio Australia
ABC Radio Australia, also known as Radio Australia, is the international broadcasting and online service operated by the Australian Broadcasting Corporation (ABC), Australia's public broadcaster. Most programming is in English, with some in Tok ...
* Radio Miami International
* Italian Broadcasting Corporation
* WBCQ (SW)
WBCQ is a shortwave radio station operating at Monticello, Maine, United States. The station is owned and operated by Allan Weiner,Ciment, James (2015). Social Issues in America: An Encyclopedia: An Encyclopedia'. Routledge. Retrieved June 27, 201 ...
* Mighty KBC
MARS
U.S. Army
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
and U.S. Air Force
The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
Military Auxiliary Radio System
The Military Auxiliary Radio System (MARS) is a United States Department of Defense sponsored program, established as a separately managed and operated program by the United States Army, and the United States Air Force. The United States Navy-M ...
.
Department of Homeland Security
Department of Homeland Security
The United States Department of Homeland Security (DHS) is the U.S. federal executive department responsible for public security, roughly comparable to the interior or home ministries of other countries. Its stated missions involve anti-terr ...
Shares program, which utilizes "existing HF radio resources of government, critical infrastructure, and disaster response organizations to coordinate and transmit emergency messages"
PSK Mail
PSKmail
project. PSK Mail allows users to retrieve and send normal emails over radio.
AirChat
encrypted
In cryptography, encryption is the process of encoding information. This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Ideally, only authorized parties can deci ...
and unencrypted
In cryptography, plaintext usually means unencrypted information pending input into cryptographic algorithms, usually encryption algorithms. This usually refers to data that is transmitted or stored unencrypted.
Overview
With the advent of comp ...
messages over unencrypted channels.
Decodeable broadcasts
The broadcasts listed below are transmitted on a regular schedule and can be decoded using Fldigi.SITOR text forecasts and storm warnings
WEFAX visual weather fax
* VOA Radiogram Broadcasts * W1AW Broadcasts
See also
*Amateur Radio
Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communic ...
* Shortwave Radio
Shortwave radio is radio transmission using shortwave (SW) radio frequencies. There is no official definition of the band, but the range always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (100 to 10 me ...
* WSPR (amateur radio software)
WSPR (pronounced "whisper") is an acronym for ''Weak Signal Propagation Reporter''. It is a protocol, implemented in a computer program, used for weak-signal radio communication between amateur radio operators. The protocol was designed, and a ...
* WSJT (amateur radio software)
* CW Skimmer
CW Skimmer is a multi-channel Morse code ( CW) decoder and analyzer program for Microsoft Windows. It was created by Alex Shovkoplyas, VE3NEA, and is marketed by Afreet Software, Inc.
CW Skimmer uses a sensitive CW decoding algorithm based on ...
* Internet Radio Linking Project
The Internet Radio Linking Project, also called IRLP links amateur radio stations around the world by using Voice over IP (VoIP). Each gateway consists of a dedicated computer running custom software that is connected to both a radio and the Inter ...
* PSK31
PSK31 or " Phase Shift Keying, 31 Baud", also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-to-keyboard chat, most often using frequenci ...
* RTTY
Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link. Radioteletype evolved from earlier landline teleprinter o ...
* American Radio Relay League
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization, and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska of ...
References
External links
* {{Digital modes Quantized radio modulation modes Amateur radio software Amateur radio software for Linux Amateur radio software for Windows Free communication software Amateur radio software for macOS