The Mystic Star high-frequency single-side-band [SSB] communications system is installed at about 10-15 Air Force bases around the world, with remote transceivers controlled via telephone voice channels from Andrews AFB. This system is used for telephone traffic when Air Force One is out of range of other UHF links, but at least two SSB voice frequencies (and a full duplex 75 baud secure teletype channel called "India Oscar" which use a special anti-multipath modem) are maintained continuously and used for coordination of other communications links. Frequencies are chosen from a list of about 150 scattered throughout the available HF spectrum and are designated by "fox" code numbers which change from time to time.
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Updated Wednesday, April 29, 1998 7:46:18 AM