TA-1 Telephone Set
© Brooke Clarke,
Unlike most other military phones the
TA-1 uses a dynamic microphone element so it's "sound powered".
Because of this there is not need for batteries. Signaling to
another field phone is by means of a built-in generator that, instead
a crank, uses a level that you pump. Probably since the output of
the mike element is feeble you need to use a Press To Talk switch so
this is a half duplex type of system similar to a radio, not like a
conventional full duplex telephone.
There are two ways you know about an incoming call, the clacker whose
volume can be adjusted from full clack to off, and the visual
indicator. The neat thing about the visual indicator is that it
is reset by pressing the Push To Talk switch, so if you miss a call the
visual indicator tells you the phone rang and no one answered.
Seems like a good feature for a normal phone.
The Push to Open connectors are intended to be used to clamp onto Army
Field Wire like WD-1.
TM 11-5805-243-13 Telephone Set
TA-1/PT NSN 5805-00-521-1320, 15 Sep. 1987
Superceeds TM 11-5805-243-12 of 14 Sep. 1959 and TM 11-5805-243-35, 9
AN/PTM-6 Telephone Test Set NSN
TS-352B/U Multimeter NSN 6625-00-553-0142
AN/PSM-45 Digital Multimeter NSN 6625-01-139-2512
The TA-5012/TTC has the look and feel
of the TA-1 but it's got a much higher nomenclature number and uses a
single AA cell for power.
The 5012 is a much higher number than the TA-1 so this seems to be a
version of the TA-1 that uses battery power instead of voice
power. If that resulted in better performance then it would make
sense. But if there's not much improvement or if the improvement
is only in some obscure application then it would not become popular.
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