TM-9-2350-274-BD

M109/M110/M578 VEHICLES HOWITZER, MEDIUM, SELF-PROPELLED FULL-TRACKED

TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

JANUARY 1984

TM-9-2350-274-BD - Page 155 of 219

TM 9-2350-274-BD

COMMUNICATIONS SYSTEM

11-10. INTERCOMMUNICATIONS SYSTEM FIELD EXPEDIENT

General Information:

This procedure gives instructions for constructing field expedient intercoms.

Limitations:

●

None

Personal/Time Required:

●

1 soldier

●

10 minutes

Materials Tools:

●

One TA-312/PT or TA-1/PT field telephone for each station where requirement for

intercom exists.

●

Cable, telephone, WD-1/TT, 10 to 15-foot length.

Other

Option(s):

●

Replace with Soviet R-124 intercom. (Refer to paragraph 11-11.)

CAUTION

Do not crank or ring the field telephone because damage

could occur to the AM-1780 and/or the entire AN/VIC-1

system.

Procedural Steps:

1. If one or more of the control boxes becomes inoperable but the AM-1780 is still

operational, install TA-312 or TA-1 field telephones at the station(s) where the bad

control boxes are located and run field telephone wire back to the AM-1780. The WD-

1/TT should be hooked up on the "line" jacks of the AM-1780.

2. If the AM-1780 is not operational, replace the entire intercom system with TA-312

or TA-1 telephones and field telephone wire.

Run the wire in a circle throughout the

vehicle so that all telephones are connected to the same wire.

11-9