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Field phones could operate point to point or via a switchboard at a command post. A variety of wire types are used, ranging from light weight "assault wire", e.g. W-130 —8.5 kilograms per kilometre (30 pounds per mile)— with a talking range about 8.0 kilometres (5 mi), to heavier cable with multiple pairs.
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 dBu.
Tank phone. A tank phone (also called a tank telephone, grunt phone, tank-infantry phone, TIP, infantry tank telephone, ITT, or infantry phone) is a telephone mounted on the exterior of armoured vehicles to facilitate communication between people outside of the vehicle and those inside, whilst avoiding the tank crew becoming exposed to enemy fire.
The field telephone 50 is packed in a rectangular box-shaped protective casing of green canvas on which a strap is secured from the same material. Inside is the actual phone that is powered by a 1.5-volt battery. A standard handset with earpiece and microphone is used (called Mikrotel). The canvas surrounding the phone has a circular opening ...
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Kellogg company logo as used from the 1920s to the 1950s. The Kellogg Switchboard and Supply Company was an American manufacturer of telecommunication equipment. Anticipating the expiration of the earliest, fundamental Bell System patents, Milo G. Kellogg, an electrical engineer, founded the company in 1897 in Chicago to produce telephone exchange equipment and telephone apparatus.
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 ...