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DESCRIPTION OF COMPONENTS. Continued - TM-11-5820-890-20-2_28
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TM-11-5820-890-20-2 Ground ICOM Radio Sets Manual
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DESCRIPTION OF COMPONENTS. Continued - TM-11-5820-890-20-2_30


TM  11-5820-890-20-2 1-17 1.8. DESCRIPTION OF COMPONENTS. Continued LOUDSPEAKER-CONTROL UNIT LS 671/VRC VOLUME HANDSET CONNECTOR ON/OFF SWITCH CB1 INDICATOR LAMP (DS1) The Loudspeaker Control Unit LS 671/VRC is designed for vehicular installations and connects to the RT or RCU through MB connectors J3 or J4. Connector J3 provides monitoring and transmission for RT A or RCU A. Connector J4 provides monitoring and transmission from RT B or RCU B. The ON/OFF switch on the loudspeaker can remotely control the operating power to the vehicular radio. BASE GROUND STRAP SYSTEM CONNECTOR (J5) THUMBSCREW AND CLAMP TRAY POWER OUT CONNECTOR (J2) (J4) (J3) POWER IN CONNECTOR (J1) CONNECTOR ASSEMBLY MOUNTING BASE, ELECTRICAL EQUIPMENT MT 6352/VRC GUIDE PIN The Mounting Base, Electrical Equipment MT 6352/VRC (MB) holds the VAA. It also provides the electrical interface to the vehicle power. The tray and base are connected by four shock mounts. Six internal ground straps are used for grounding. The base is bolted to the shelf of the vehicle. The base has four thumbscrews and clamps; two hold the VAA in place; two hold the lower RT or RCU in place. The guide pin and system connector help aline the VAA or PSA. There are five connectors on the connector assembly in the back of the MB. The system connector mates with the system connector on the VAA. The operating voltage (22 to 32 V dc) from the vehicle's electrical system is connected to the power in connector, J1. A second MB or PA mount is connected to the power out connector J2. The vehicle intercom or LS 671/VRC loudspeaker, for RT A or RCU A, is connected to J3. The vehicle intercom or LS 671/VRC loudspeaker, for RT B or RCU B, is connected to J4.


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