A small monolithic field telephone made in the USA and used by most NATO countries during the Cold War. It is distinguished by the fact that it does not need a battery, although in principle it is a telephone apparatus designed for the same use as the MB network. Call possible only in simplex mode.
Type: battery-free field telephone
Ringing: button-operated alternating current generator (squeeze)
Call indication: handset growl and visual cross-talk
Range: over a two-wire line comparable to PK2, about 2 km.
Possible full communication with classic MB device (tested from TP-25)
Source: own collection
Type: battery-free field telephone
Ringing: button-operated alternating current generator (squeeze)
Call indication: handset growl and visual cross-talk
Range: over a two-wire line comparable to PK2, about 2 km.
Possible full communication with classic MB device (tested from TP-25)
Source: own collection