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The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...
The AN/FPS-27 Radar was a long-range early warning radar used by the United States Air Force Air Defense Command.. Westinghouse Electric Corporation built a frequency diverse (FD) search radar designed to operate in the S-band from 2322 to 2670 MHz.
Much of the site is devoted to the enormous overhead wire antenna array that is necessary to efficiently radiate the VLF waves. The antenna, shown above, consists of ten catenary cables, 5,640–8,700 ft (1,719–2,652 m, 1.1–1.6 miles) long, suspended in a zigzag pattern over the valley between Wheeler mountain and Blue mountain on twelve 200 ft. towers on the mountains' crests.
1171 foot (357 meter) tower Zendmast Ruiselede: Ruiselede, Belgium: 16.2 kHz 51.25 kHz: used before World War II three 287 metres, today active on higher frequency with an antenna of four masts with heights of 121 and 122 metres JXN: Gildeskål, Norway: 16.4 kHz
FREQUENCY : BAND: FREQUENCY (MHz) A: 0 – 250 I: ... US- MILITARY / SACLANT [citation needed] N: 100 000 – 200 000 O: 100 000 – 200 000
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The NATO A band is the obsolete designation given to the radio frequencies from 0 to 250 MHz (equivalent to wavelengths from 1.2 m upwards) during the cold war period. Since 1992, frequency allocations, allotment and assignments are in line with the NATO Joint Civil/Military Frequency Agreement. [1]
Typical GWEN relay node. The Ground Wave Emergency Network (GWEN) was a US Air Force command and control communications system, deployed briefly between 1992 and 1994, intended for use by the United States government to facilitate military communications before, during and after a nuclear war.