High Frequency Global Communications System
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The High Frequency Global Communications System is a network of single sideband shortwave transmitters of the United States Air Force which is used to communicate with aircraft in flight, ground stations and some United States Navy surface assets. All worldwide receiving and transmitting sites in the HF-GCS system are remotely controlled from Andrews AFB. Before 1 October 2002 it was known as the Global High Frequency System. HF-GCS stations tend to operate in the avi...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The High Frequency Global Communications System is a network of single sideband shortwave transmitters of the United States Air Force which is used to communicate with aircraft in flight, ground stations and some United States Navy surface assets. All worldwide receiving and transmitting sites in the HF-GCS system are remotely controlled from Andrews AFB. Before 1 October 2002 it was known as the Global High Frequency System. HF-GCS stations tend to operate in the aviation bands clustered around 5, 8 and 11/12 MHz, although other frequencies are in use. The primary HF-GCS voice frequencies are 4724.0 kHz, 6739.0 kHz, 8992.0 kHz, 11175.0 kHz, 13200.0 kHz and 15016.0 kHz. In addition to the HF-GCS, U.S. aircraft frequently use Military Affiliate Radio System HF stations and Canadian Forces HF stations to relay messages. One common use for the HF-GCS is to place telephone calls from the aircraft in flight by means of the Defense Switched Network to an Air Force base to obtain local weather conditions, to arrange for refueling, and to inform the base of the number of passengers and crew.
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