TA-1 Telephone Set
© Brooke Clarke, N6GCE
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 of 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 Oct. 1959.
Dynamo electric machine, Durbin
Vernon, National Pneumatic Co Inc,1957-10-01
- TA-1 Field Phone
Uses what amounts to a fly-ball governor to open switch
contacts to disconnect talk circuit.
Generator-transducer switching system in a telephone
W Johnson, National Pneumatic Co Inc, 1959-05-26 -
TA-1 Field Phone
There is a small generator winding that's feed to a full
wave bridge rectifier which in turn pulls in a relay
disconnecting the talking circuit when sending ringing.
Field telephone hand set, Durbin
W Johnson, National Pneumatic Co Inc, 1960-03-22 -
TA-1 Field Telephone
AN/PTM-6 Telephone Test Set
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a newer version of the TA-1 that uses battery power instead of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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