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Field telephones are telephones used for military communications. They can draw power from their own battery, from a telephone exchange (via a central battery known as CB), or from an external power source. Some need no battery, being sound-powered telephones . Telephone linesmen ford Lunga River during the Guadalcanal Campaign of World War II.
The TA-57 can be used for induction calls working with 2-wire lines in an OB (local battery) or a ZB (central battery) operation. It can be used to transmit voice messaging in ranges between 0.3 and 3.4 kHz, with a calling frequency of 15 to 45 Hz. Absolute signal level at output of transmission path with a 600Ω load ranges between -3 and +3 ...
AN/PRC-77 Portable Transceiver. AN/PRC 77 radio and handset. Soldier using a PRC-77 (top) with the KY-38 "Manpack," part of the NESTOR voice encryption system that was used during the Vietnam War. U.S. Marine carrying a PRC-77 during a training exercise in 1989. AN/PRC 77 Radio Set is a manpack, portable VHF FM combat-net radio transceiver ...
Military communications – or "comms" – are activities, equipment, techniques, and tactics used by the military in some of the most hostile areas of the earth and in challenging environments such as battlefields, on land (compare radio in a box ), underwater and also in air. Military comms include command, control and communications and ...
Tucker Telephone. The Tucker Telephone is a torture device designed using parts from an old-fashioned crank telephone. The electric generator of the telephone is wired in sequence to two dry cell batteries so that the instrument can be used to administer electric shocks to another person.
Modern emergency telephone powered by sound alone. A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [1] for both routine and emergency communication ...
Signaller. A signaller, signalman, colloquially referred to as a radioman or signaleer [1] in the armed forces is a specialist soldier, sailor or airman responsible for military communications. Signallers, a.k.a. Combat Signallers or signalmen or women, are commonly employed as radio or telephone operators, relaying messages for field ...
The United States Army Signal Corps ( USASC) is a branch of the United States Army that creates and manages communications and information systems for the command and control of combined arms forces. It was established in 1860, the brainchild of Major Albert J. Myer, and had an important role in the American Civil War.