Field telephone

A field telephone is a special telephone set that is constructed according to the requirements of the operation under military conditions.

1879 Wilhelm Emil Fein received a patent for a phone with a horseshoe magnet and 1885 one for another militarily occupied field telephone - this is considered the first portable phone in the world. In Germany, the first Army telephone from 1905 to 1918 were used in the army.

The army consisted of a metallic telephone handset with buzzer, buzzer button and Lauthörtaste. In addition to voice communication also signals by Morse code could be transmitted. To make calls on the move, an additional head Fernhörer could be connected. The army telephone ( in the leather-covered Blechfutteral ) was carried along with the battery and the cable pocket on the back. The signal transfer took one wire to ground.

As of 1916, the then long time common box-shaped design came up. The FF 16 Type B Siemens & Halske already contained buzzer, a powerful local battery and crank generator and telephone receiver in a wooden box. In later designs, the wooden box with bakelite (eg type SF 882 ) or metal (type OB -ZB 38) replaced or other plastics.

Talk button d SFT -800

Field telephone FF OB / ZB

FF33 field telephone of the German Wehrmacht, developed in 1933

For the German Army in the late 1960s, a new field telephone with the name FF-OB/ZB ( field telephone, Ortsbatterie-/Zentralbatteriebetrieb ) was procured. With the development of the company Standard Elektrik Lorenz (SEL ) has been entrusted; were produced, the field telephone by other firms such as Deutsche telephone mbH (DFG). The device consists of a box of fiber compression fabric with a flap, under which the terminals, the handset and other accessories are housed. The use is governed by the TDv 5805 / 006. As a direct accessories there is a plug- Wählzusatz that allows the operation to an outside line or to a PBX. Another accessory is a switch for 10 participants and an additional office for mediation available, which can be combined include up to three 10 mediations to a 30er switching. With the advent of digital technology, a Wählfernsprecher with modem connection from the company crown was procured in the 1990s. This field telephone was " 90 Autoko " operated in the system and mainly used by military units who were responsible for radio links. Due to the high mobility, which is now requested by military units, and because of the high cost of field cable construction of the field telephone is increasingly being replaced by wireless technology.

In the civil sector of the field telephone at major events and major incidents in fire brigade, and in private services is still using.