This video covers 10 things you gotta know about the amazing TA-1/PT military field telephone from the 80's and 90's:
1). The system is voice powered / no batteries required to operate
2). Voice is transmitted and received with Carbon Transducer mouthpiece and earpiece
3). Because no powered amplification, these work pretty quietly
4). 4 mile range over two-wire WD-1wire
5). Each unit has a generator to ring other line (80V)
6). Volume control on the bottom of the unit is for the ringer volume only
7). A yellow call indicator provides visual alert of incoming call
8). Daisy chainable with multiple units
9). Half-duplex communication -- only one person can talk at a time
10). Comes with a rugged carrying case for transportation
Operator's manual can be found at: [ Ссылка ]
