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D-STAR
D-STAR (Digital Smart Technologies for Amateur Radio) is a digital voice and data protocol specification for amateur radio. The system was developed in the late 1990s by the Japan Amateur Radio League and uses minimum-shift keying in its packet-based standard. There are other digital modes that have been adapted for use by amateurs, but D-STAR was the first that was designed specifically for amateur radio. Several advantages of using digital voice modes are that it uses less bandwidth than older analog voice modes such as amplitude modulation and frequency modulation. The quality of the data received is also better than an analog signal at the same signal strength, as long as the signal is above a minimum threshold and as long as there is no multipath propagation. D-STAR compatible radios are available for HF, VHF, UHF, and microwave amateur radio bands. In addition to the over-the-air protocol, D-STAR also provides specifications for network connectivity, enabling D-STAR ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Radio Repeater
An amateur radio repeater is an electronic device that receives a weak or low-level amateur radio signal and retransmits it at a higher level or higher power, so that the signal can cover longer distances without degradation. Many repeaters are located on hilltops or on tall buildings as the higher location increases their coverage area, sometimes referred to as the radio horizon, or "footprint". Amateur radio repeaters are similar in concept to those used by public safety entities (police, fire department, etc.), businesses, government, military, and more. Amateur radio repeaters may even use commercially packaged repeater systems that have been adjusted to operate within amateur radio frequency bands, but more often amateur repeaters are assembled from receivers, transmitters, controllers, power supplies, antennas, and other components, from various sources. Introduction In amateur radio, repeaters are typically maintained by individual hobbyists or local groups of amateur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icom Incorporated
is a Japanese manufacturer of radio transmitting and receiving equipment, founded in 1954 by Tokuzo Inoue with the company's original name being "Inoue". Its products now include equipment for radio amateurs, pilots, maritime applications, land mobile professional applications, and radio scanner enthusiasts. Its headquarters are in Osaka, Japan. It has branch offices in the United States (in Kirkland, Washington), Canada (in Delta, British Columbia), Australia (Melbourne, Victoria), New Zealand (Auckland), the United Kingdom (Kent, England), France (Toulouse), Germany ( Bad Soden), Spain (Barcelona) and the People's Republic of China (Beijing). Protocols IDAS IDAS is Icom's implementation of the NXDN protocol for two-way digital radio products intended for commercial Private Land Mobile Radio (PLMR) and low-end public safety communications systems. NXDN is a Common Air Interface (CAI) technical standard for mobile communications. It was developed jointly by Icom and Kenw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Radio
Amateur radio, also known as ham radio, is the use of the radio frequency radio spectrum, spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency, emergency communications. The term ''"radio amateur"'' is used to specify ''"a duly authorized person interested in radioelectric practice with a purely personal aim and without wikt:pecuniary, pecuniary interest"'' (either direct monetary or other similar reward); and to differentiate it from commercial broadcasting, public safety (police and fire), or two-way radio professional services (maritime, aviation, taxis, etc.). The amateur radio service (''amateur service'' and ''amateur-satellite service'') is established by the International Telecommunication Union (ITU) through their recommended radio regulations. National governments regulate technical and operational characteristics of transmissions and issue individual station li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kenwood Corporation
is a Japanese brand of consumer electronics. Since October 2008, Kenwood has been owned by JVCKenwood as a result of a merger between Kenwood Corporation and JVC. Kenwood has manufactured electronic equipment such as AM/FM stereo receivers, cassette tape decks/recorders, amateur radio (ham radio) equipment, radios, televisions, cellular phones, speakers, and other consumer electronics. History Kenwood was established in 1946 as the Kasuga Radio Co. Ltd. in Komagane, Nagano Prefecture, Japan. In 1960, the company was renamed Trio Corporation. In 1963, the company established its first overseas office in Los Angeles County, California, United States. During the early 1960s, Trio's products were rebranded and sold by the Lafayette Radio Company, which focused on citizens band (CB) radio. A&A Trading Co. imported Japanese-made electronics for RadioShack. William "Bill" Kasuga, a bilingual Japanese-speaking manager at A&A, partnered with George Aratani and Yoichi Nakase to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AMSAT
AMSAT is a name for various amateur radio satellite organizations worldwide. In particular, it often refers to the Radio Amateur Satellite Corporation, headquartered in Washington, D.C. AMSAT organizations design, build, arrange launches for, and then operate (command) satellites carrying amateur radio payloads, including the OSCAR series of satellites. Other informally affiliated national organizations exist, such as AMSAT Germany (AMSAT-DL) and AMSAT Japan (JAMSAT). History AMSAT was founded in 1969 in Washington, D.C. to continue the efforts begun by OSCAR, Project OSCAR. Its first project was to coordinate the launch of Australis-OSCAR 5, OSCAR 5, constructed by students at the University of Melbourne. Some design modifications were needed and were made by AMSAT members, and the satellite was successfully launched on 30 January 1970, on a NASA Delta (rocket family), Thor Delta launch vehicle. AMSAT's next launch was AMSAT-OSCAR 6 (AO-6) on 15 October 1972. AO-6 was AMSAT' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haymarket, Virginia
Haymarket is a town in Prince William County, Virginia, United States. The population was 1,545 as of the 2020 census. History Haymarket is built on land that used to be hunting grounds of the western Iroquois nations, who came from the New York and Pennsylvania area around the Great Lakes. They used hunting paths through the land until 1722, when they made a treaty with the colonies of Virginia and New York to move into the Blue Ridge Mountain region. Due to the hunting paths, this location, and later the town, were given the nickname ''The Crossroads''. The town of Haymarket began to be developed and built after the American Revolutionary War, formally founded in 1799 on the land of William Skinker. The Virginia General Assembly gave Skinker the rights to lay out the town, which he drew to consist of 13 streets and 140 lots. Shortly after, a clerk's office and jail were constructed in 1801, as the town had been selected as the site of what is now a district court. The town o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlanta, Georgia
Atlanta ( ) is the List of capitals in the United States, capital and List of municipalities in Georgia (U.S. state), most populous city in the U.S. state of Georgia (U.S. state), Georgia. It is the county seat, seat of Fulton County, Georgia, Fulton County and extends into neighboring DeKalb County, Georgia, DeKalb County. With a population of 520,070 (2024 estimate) living within the city limits, Atlanta is the eighth most populous city in the Southeastern United States, Southeast and List of United States cities by population, 36th most populous city in the United States according to the 2020 United States census, 2020 U.S. census. Atlanta is classified as a Globalization and World Cities Research Network#Beta +, Beta + global city and is the principal city of the much larger Atlanta metropolitan area, the core of which includes Cobb County, Georgia, Cobb, Clayton County, Georgia, Clayton and Gwinnett County, Georgia, Gwinnett counties, in addition to Fulton and DeKalb. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miniaturized Satellite
A small satellite, miniaturized satellite, or smallsat is a satellite of low mass and size, usually under . While all such satellites can be referred to as "small", different classifications are used to categorize them based on mass. Satellites can be built small to reduce the large economic cost of launch vehicles and the costs associated with construction. Miniature satellites, especially in large numbers, may be more useful than fewer, larger ones for some purposes – for example, gathering of scientific data and radio relay. Technical challenges in the construction of small satellites may include the lack of sufficient power storage or of room for a propulsion system. Rationales One rationale for miniaturizing satellites is to reduce the cost; heavier satellites require larger rockets with greater thrust that also have greater cost to finance. In contrast, smaller and lighter satellites require smaller and cheaper launch vehicles and can sometimes be launched in mult ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ICOM IC-91AD D-STAR Handheld Transceiver
ICOM may refer to: * International Council of Museums * Idaho College of Osteopathic Medicine, a medical school in the United States * Icom Incorporated, radio equipment manufacturer * Industrial Common Ownership Movement (ICOM), a co-operative federation that now forms part of Co-operatives UK * Inputs, Controls, Outputs, and Mechanisms (ICOM), the conceptual parts of the IDEF0 function modeling methodology * ICOM Simulations ICOM Simulations, Inc. (later known as Rabid Entertainment) was a software company based in Wheeling, Illinois. It is best known for creating the MacVenture series of adventure games including '' Shadowgate''. Following the foundation in 1981 ..., software company * ICOM Tele A/S, a Danish telecommunications operator {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doppler Shift
The Doppler effect (also Doppler shift) is the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave. The ''Doppler effect'' is named after the physicist Christian Doppler, who described the phenomenon in 1842. A common example of Doppler shift is the change of pitch (music), pitch heard when a vehicle sounding a horn approaches and recedes from an observer. Compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession. When the source of the sound wave is moving towards the observer, each successive cycle of the wave is emitted from a position closer to the observer than the previous cycle. Hence, from the observer's perspective, the time between cycles is reduced, meaning the frequency is increased. Conversely, if the source of the sound wave is moving away from the observer, each cycle of the wave is emitted from a position ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Radio Contact
An amateur radio contact, more commonly referred to as simply a "contact", is an exchange of information between two amateur radio stations. The exchange usually consists of an initial call, a response by another amateur radio operator at an amateur radio station, and a signal report. A contact is often referred to by the Q code QSO. It is often limited to just a minimal exchange of such station IDs. Stations who have made a contact are said to have ''worked'' each other. An operator may also say that he has ''worked'' a certain country. Amateurs use the slang expression ''ragchew'' or ''ragchewing'' to refer to an extended, informal conversation, a variation of the common idioms "chewing the fat" and "chewing the rag". Sometimes, a contact in person, between two ham radio operators, is humorously referred to as an "eyeball QSO". An All-Time New One (ATNO) is an operator's contact with an amateur station that they have never worked before on any band or mode. Many amateurs wil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Liège
The University of Liège (), or ULiège, is a major public university of the French Community of Belgium founded in 1817 and based in Liège, Wallonia, Belgium. Its official language is French (language), French. History The university was founded in 1817 by William I of the Netherlands, then King of the United Kingdom of the Netherlands, and by his Minister of Education, Anton Reinhard Falck. The foundation of the university was the result of a long intellectual tradition which dates back to the origins of the Prince-Bishopric of Liège. Beginning in the eleventh century, the influence of the principality attracted students and prominent scientists and philosophers, such as Petrarch, to study in its libraries. The reputation of its medieval schools gave the city the reputation as Athens#Cities nicknamed "Athens", a new Athens. A 17 March 1808 decree by Napoleon I of France, Napoleon I concerning the organization of an imperial university indicated Liège as the site of a new ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
