TM-9-2350-273-BD M60 M48 Battle Damage Assessment and Repair Download
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TM 9-2350-273-BD CHAPTER 11 COMMUNICATION SYSTEMS BDAR FIXES SHALL BE USED ONLY IN COMBAT AT THE DISCRETION OF THE COMMANDER AND SHALL BE REPAIRED BY STANDARD MAINTENANCE PROCEDURES AS SOON AS PRACTICABLE AFTER THE MISSION IS COMPLETED. SECTION I. General 11-1. Scope. This chapter contains the fault assessment and expedient repair procedures needed to locate and fix battlefield damage to the vehicle’s communications system. 11-2. General. The procedures in this chapter are used to repair battlefield damage to the AN/VIC-1 intercommunications set, the radio systems, the KY-57 (KY-38) speech security system and all associated wiring and cables. 11-3. Functional Details. a. The AN/VIC-l intercom set consists of the AM-1780 amplifier, four C-2298 or C-10456 control boxes, one C-2742 remote switching control box, four CVC helmets and all associated wiring and cables. The AN/VIC-1 allows voice intercom to take place between the vehicle commander and all crew members. b. Three basic configurations of radio systems are installed in most tracked vehicles. All three radio systems supply non-secure frequency modulation (FM) voice radio capabilities through the AN/VIC-1 intercom set to the tank commander and all crew members. All three radio systems utilize the MT- 1029 mount for the basic receiver-transmitter and the MT- 1898 mount for the auxiliary receiver. The MX-6707 matching unit is used in conjunction with all receiver-transmitters and the AB-558 mast base is used in conjunction with the auxiliary receivers. The AS- 1729 antenna system is used with all receiver-transmitters and either the MS-116A, MS-117A, and the MS-118A antenna elements or the AT-1095 antenna element is used with the auxiliary receivers. All associated wiring and cables are the same for each system. (1) The AN/VRC-12 consists of a RT-246 receiver-transmitter with 10 preset channels which can be automatically switched and tuned by means of the C-2742 remote switching control box and a R-442 auxiliary receiver. 11-1