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Blind Transmission
A blind transmission, in telecommunications, is a transmission made without obtaining a receipt, or acknowledgment of reception, from the intended receiving station. Blind transmissions may occur or be necessary when security constraints, such as radio silence, are imposed, when technical difficulties with a sender's receiver or receiver's transmitter occur, or when lack of time precludes the delay caused by waiting for receipts. Examples *In aviation it is common to "transmit in the blind" when an aircraft is approaching a non-towered airport. The pilot will broadcast his position and intentions over a common frequency. If no other aircraft are in the traffic pattern, the pilot continues to transmit his position in the blind in case another aircraft is in the area but unable to respond. *The less common reason would be a ground control station not being able to transmit (due to transmitter failure) or not wanting to transmit any acknowledgment (to avoid giving away further informat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telecommunications
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that feasible with the human voice, but with a similar scale of expediency; thus, slow systems (such as postal mail) are excluded from the field. The transmission media in telecommunication have evolved through numerous stages of technology, from beacons and other visual signals (such as smoke signals, semaphore telegraphs, signal flags, and optical heliographs), to electrical cable and electromagnetic radiation, including light. Such transmission paths are often divided into communication channels, which afford the advantages of multiplexing multiple concurrent communication sessions. ''Telecommunication'' is often used in its plural form. Other examples of pre-modern long-distance communication included audio messages, such as coded drumb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Receiver
A communications receiver is a type of radio receiver used as a component of a radio communication link. This is in contrast to a ''broadcast receiver'' which is used to receive radio broadcasts. A communication receiver receives parts of the radio spectrum not used for broadcasting, that includes amateur, military, aircraft, marine, and other bands. They are often used with a radio transmitter as part of a two-way radio link for shortwave radio or amateur radio communication, although they are also used for shortwave listening. Features Commercial communications receivers are characterized by high stability and reliability of performance, and are generally adapted for remote control and monitoring. For marketing purposes, many hobby-type receivers are advertised as "communications receivers" although none are suited for heavy-duty, reliable 24-hour use as the primary form of communication for an isolated station. Typically, a communications receiver is of the superheterody ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transmitter
In electronics and telecommunications, a radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna (radio), antenna. The transmitter itself generates a radio frequency alternating current, which is applied to the Antenna (radio), antenna. When excited by this alternating current, the antenna radiates radio waves. Transmitters are necessary component parts of all electronic devices that communicate by radio communication, radio, such as radio broadcasting, radio and television broadcasting stations, cell phones, walkie-talkies, Wireless LAN, wireless computer networks, Bluetooth enabled devices, garage door openers, two-way radios in aircraft, ships, spacecraft, radar sets and navigational beacons. The term ''transmitter'' is usually limited to equipment that generates radio waves for Communication engineering, communication purposes; or radiolocation, such as radar and navigational transmitters. Generators of radio waves for heatin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UAV Ground Control Station
UAV ground control station (GCS) is a land- or sea-based control centre that provides the facilities for human control of ''Unmanned Aerial Vehicles'' (UAVs or "drones"). It may also refer to a system for controlling rockets within or above the atmosphere, but this is typically described as a Mission Control Centre. Hardware 300px, The inside of the Bayraktar TB2 GCS GCS hardware refers to the complete set of ground-based hardware systems used to control the UAV. This typically includes the Human-Machine Interface, computer, telemetry, video capture card and aerials for the control, video and data links to the UAV. Fixed Installation and Vehicle Mounted GCS 300px, Two ground control stations of Ukrainian Air Force Bayraktar TB2 ">Bayraktar_TB2.html" ;"title="Ukrainian Air Force Bayraktar TB2">Ukrainian Air Force Bayraktar TB2 Larger military UAVs such as the General Atomics MQ-1 Predator feature what resembles a "virtual cockpit". The pilot or Airborne Sensor Operato ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transmission Time
In Telecommunications network, telecommunication networks, the transmission time is the amount of time from the beginning until the end of a message transmission. In the case of a digital message, it is the time from the first bit until the last bit of a message has left the transmitting Node (networking), node. The packet transmission time in seconds can be obtained from the ''packet size'' in bit and the bit rate in bit/s as: :Packet transmission time = Packet size / Bit rate Example: Assuming 100 Mbit/s Ethernet, and the maximum packet size of 1526 bytes, results in :Maximum packet transmission time = 1526×8 bit / (100 × 106 bit/s) ≈ 122 μs Propagation delay The transmission time should not be confused with the propagation delay, which is the time it takes for the first bit to travel from the sender to the receiver (During this time the receiver is unaware that a message is being transmitted). The Velocity of propagation, propagation speed depends on the Transmission med ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Institute For Telecommunication Sciences
The Institute for Telecommunication Sciences (ITS) performs the research and engineering that enables the U.S. Government, national and international standards organizations, and many aspects of private industry to manage the radio spectrum and ensure that innovative, new technologies are recognized and effective. Past experience, current knowledge, and facilities allow the institute to solve complex telecommunications problems, as well as visually postulate the significant needs for the future. ITS is notable for pioneering work on radio wave propagation, development of measurement methods to characterize complex signals, and predict end-to-end system performance. This government entity also provides research and engineering that is critical to continued U.S. leadership in telecommunications technology. (Dept. of Commerce) Overview The Institute for Telecommunication Sciences (ITS) is the research and engineering laboratory of the National Telecommunications and Information ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
