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Radio call signs are a globally unique identifier assigned to all stations that are required to obtain a license in order to emit RF energy. The identifiers consist of from 3 to 9 letters and digits, and while the basic format of the call signs are specified by the ITU-R Radio Regulations, Article 19, Identification of stations, [5] the details are left up to each country's radio licensing ...
On the ICAO flight plan form (e.g. FAA Form 7233-4 based on the format specified by ICAO Doc 4444) one or more alphabetic codes are placed in box 10. Multiple letters are used to describe individual radio navigational capabilities and a single letter is used to designate the transponder.
[7] [10] 1203–1272 US: Discrete 1200 series codes unless otherwise allocated (for example, 1255), designated for DVFR aircraft and only assigned by a flight service station. [3] 1255 US: Aircraft not in contact with an ATC facility while enroute to/from or within the designated fire fighting area(s). [3] [11] 1273–1275 US
Letter beacons are radio transmissions of uncertain origin and unknown purpose, consisting of only a single repeating Morse code letter. They have been classified into a number of groups according to transmission code and frequency, and it is supposed that the source for most of them is Russia and began during the Soviet Union.
The AN/PRC-10 is an American VHF portable radio transceiver, introduced in 1951 [1] as a replacement for the wartime SCR-300 set. The AN/PRC-8 and AN/PRC-9 sets are basically the same but cover lower frequency bands.
Supermarine Spitfire Mk Vb of the Polish 303 Kościuszko Squadron showing the RAF squadron code "RF" of 303 Squadron and the individual aircraft letter "D" which would be spoken, D-Dog Instruction page from WW I U.S. Army trench code, Seneca edition, with spelling alphabet for telephone and radio use
Code-division multiple access (CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel.
Peilgerät (PeilG) 6: Codenamed "Alex Sniatkowski", this was a long and medium range D/F set and homing device used mainly on bombers: Ar 234, Do 217, Ju 87, Ju 88A-4 on, Ju 188, Ju 290, Ju 388; the He 177A heavy bombers (Germany's only "heavy bomber" design in service), and both the He 219A and Ju 88G night fighter series are some of the aircraft types to be fitted.