TA-312~PT

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TA-312-6.png

The TA-312/PT and the TA-43/PT are two-wire, battery-operated field telephones. They may be used in a point-to-point wire system or in any two-wire ring-down subscriber position of a telephone communications system. The Handset H-60 contains a push-to-talk switch which connects power for talking. The TA-312/PT has a built-in Receptacle Connector U-79/U for use with a headset and an associated EXT-INT switch; the TA-43/PT does not. The TA-43/PT is being replaced by the TA-312/PT. The TA-955/PT dual tone multi frequency (DTMF) adapter allows push button operational interface with automatic analog switches and regular civilian type phone systems.


Differences Between TA-312 and TA-312A

TA-312 vs TA-312A.png


  1. Case on the "A" is made from a composite material, and the TA-312 is metallic
  2. The handset retaining spring on the "A" is a locking mechanism, you need to push the handset upward to release it. The regular TA-312 has a simple spring.
  3. The "A" version has recessed areas around the battery lock and the EXT-INT switch.
  4. The "A" version has screws to retain the hinges
  5. The ID plates on the "A" is horizontal, where the standard version is vertical.


Technical Characteristics

Range
Wet
Approximately 22.5km(14mi) on WD-1/TT (36 dB working limit)
Dry
Approximately 36.4 km (22 mi) on WD-1/TT (36 dB working limit)


Type of Operation
Common Battery
Voice transmission and signaling power supplied by switchboard
Local Battery
Voice transmission power supplied by two BA-30s, signaling power supplied by a hand-crank generator
Common-Battery Signaling
Signaling power supplied by switchboard, voice transmission provided by two BA-30s
Signaling (Outgoing)
Hand generated, 90 to 100VAC, 20Hz
Signaling (Incoming)
Audible tone, adjustable volume


Controls and Indicators

Hook Switch
Connects H-60PT to line during operation. Switch is operated when H-60/PT is removed from retaining cradle and is open when H-60PT is in retaining cradle.
Selector Switch
Connects internal circuits of TA-312/PT for particular type of service to be used:
Position
CB
Common battery operation.
LB
Local battery operation.
CBS
Common battery signaling (local battery for voice).
EXT-INT Switch
Permits selection of H-144(*)/U in place of H-60/PT:
EXT
Selects H-144(*)/U (H-60/PT inoperative).
INT
Selects H-60/PT (H-144(*)/U inoperative).
LOW-LOUD
Adjusts BZ-23/PT (ringer) Volume
HandCrank (part of G-4WPT)
When turned, operates G-42A/PT for signaling in LB operation.

Other Images


Related Files

Adobe PDF icon.png TM 11-5805-201-12

Organizational Maintenance Manual
Telephone Set
TA-312/PT (5805-00-543-0012)
June 1967


Adobe PDF icon.png TM 11-5805-201-23P

Operator’s and Direct Support Maintenance
Repair Parts and Special Tools List
Telephone Sets
TA-312/PT (5805-00-543-0012)
TA-312A/PT (5805-01-217-7310)
1 January 1987


Adobe PDF icon.png TM 11-5805-201-35

DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TELEPHONE SET
TA-312/PT (5805-00-543-0012)
September 1967