TM-9-2350-274-BD M109 Battlefield Damage Assessment and Repair Download
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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