2019年6月16日 · Differences Between TA-312 and TA-312A. Case on the "A" is made from a composite material, and the TA-312 is metallic; 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. The "A" version has recessed areas around the battery lock and the EXT ...

modified TA-312 field telephone. Field telephones are telephones used for military communications. They can draw power from their own battery, from a telephone exchange (via a central battery known as CB), or from an external power source. Some need no battery, being sound-powered telephones.

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This manual describes Telephone Sets TA-312/PT and TA-312A/PT and covers their installation, operation, and unit maintenance. It includes operation under usual and unusual conditions, cleaning and inspection of the equipment, and replacement of authorized parts for unit maintenance personnel. Unless otherwise indicated, wherever a reference to ...

The TA-312 is the Cadillac of Field Phones. This tried and true design has been battle tested from the 1950s-1990s. Common battery operation on two D batteries. Hand crank generates outgoing signal. Designed to have a dry operating range of over 20 miles when paired with U.S. G.I. Telephone Cable.

The US signal corps field telephones TA-43/PT and TA-312/PT are nearly identical instruments. The only difference being that the TA-312/PT ads a plug which can be used to connect an external head-/chest-set or an external DTMF dialpad.

TA-312/PT. T O install the TA-312/PT (designated. PHONE 4) in its mounting bracket (fig. 11. and 23), follow the procedures in a below. When the TA-312/PT's are to be used at the. status board (fig. 12) or in front of the. shelter (fig. 13), position each TA-312/PT. near the desired PHONE jack and perfom the.

The TA-312A/PT is a two-wire, battery-operated field telephone designed for robust voice frequency wire communications in field environments. It can function as a point-to-point communication link or integrate into a telephone system as a ringdown subscriber.

Small, rugged, water-proof, portable field telephone that was designed primarily for operation in the field on a local battery system. However, the telephone will also operate on a common battery signaling system.