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Wide FM, 20.0 kHz width, ±5 kHz deviation, still widely used for amateur radio, NOAA weather radio, marine, and aviation users and land mobile users below 50 MHz 11K2 F3E Narrow FM, 11.25 kHz bandwidth, ±2.5 kHz deviation – In the United States, all Part 90 Land Mobile Radio Service (LMRS) users operating above 50 MHz were required to ...
The 20-meter or 14-MHz amateur radio band is a portion of the shortwave radio spectrum, comprising frequencies stretching from 14.000 MHz to 14.350 MHz. The 20-meter band is widely considered among the best for long-distance communication ( DXing ), and is one of the most popular—and crowded—during contests . [2]
Japanese naval codes. The vulnerability of Japanese naval codes and ciphers was crucial to the conduct of World War II, and had an important influence on foreign relations between Japan and the west in the years leading up to the war as well. Every Japanese code was eventually broken, and the intelligence gathered made possible such operations ...
Air is thin enough that in the Earth's atmosphere radio waves travel very close to the speed of light. The wavelength is the distance from one peak (crest) of the wave's electric field to the next, and is inversely proportional to the frequency of the wave. The relation of frequency and wavelength in a radio wave traveling in vacuum or air is.
The codes' procedure words, a type of voice procedure, are designed to convey complex information with a few words, when brevity is required but security is not. Ten-code, North American police brevity codes, including such notable ones as 10-4. Phillips Code. NOTAM Code. Wire signal, Morse Code abbreviation, also known as 92 Code.
German code breaking in World War II achieved some notable successes cracking British naval ciphers until well into the fourth year of the war, [1] using the extensive German radio intelligence operations during World War II. Cryptanalysis also suffered from a problem typical of the German armed forces of the time: numerous branches and ...
Fox (code word) Fox is a brevity code used by NATO pilots to signal the simulated or actual release of an air-to-air munition or other combat function. Army aviation elements may use a different nomenclature, as the nature of helicopter -fired weapons is almost always air-to-surface. "Fox" is short for "foxtrot", the NATO phonetic designation ...
25 October 1944. ( 1944-10-25) Radio Londres ( [ʁa.djo lɔ̃dʁ], French for "Radio London") was a radio station broadcast from 1940 to 1944 by the BBC in London to Nazi-occupied France. It was entirely in French and was operated by the Free French who had escaped from occupied France. It served not only to counter the propaganda broadcasts of ...