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TM 11-5820-890-20-2
5-1
CHAPTER 5
SINGLE RADIO MOUNT (SRM)
Subject
Para
Page
Principles of Operation
5.1
5-1
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Operational Check
5.2
5-4
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Troubleshooting Flowcharts
5.3
5-10
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Cable Schematics
5.4
5-49
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5.1.
PRINCIPLES OF OPERATION.
This section covers the principles of operation for the AN/VRC 87C configurations.
a.
DC POWER INPUT AND DISTRIBUTION.
(1) Vehicular Power. The vehicular battery provides an input voltage that may vary from 22 to 32 V dc.
The battery is connected to the mounting base by a power cable. In some vehicles, the cable is
connected to a terminal block which is connected to the battery.
The power cable has a four pin connector that connects to J1 of the mounting base. Pin A of
the power cable is the black lead which connects to the negative terminal. Pin B of the power
cable is the red lead which connects to the positive terminal.
(2) Power Distribution in Mounting Base MT 6576 or MT 6352 Series. The 22 to 32 V dc enters the
mounting base on pin B of connector J1 and is wired to pin B of J2, J3, and J4. Connector J2 is the
power out connector and provides 22 to 32 V dc to either a PA mount or a second mounting base.
Connector J3 or J4 supply 22 to 32 V dc to be used by the AN/VIC 1(V), the LS 671 loudspeaker,
and other peripheral equipment. Pin B of J1 is also connected to J5, pin B through FL1 and FL2. FL1
and FL2 are filters used to remove electromagnetic interference (EMI) and electromagnetic pulse
(EMP) which appear as power surges.
The single radio mount configurations may use either MT 6576 or MT 6352 series. The only
difference is that the MT 6576 is smaller which allows for installation in tight spaces.
(3) Power Distribution in Power Supply Adapter MX 10862. The 22 to 32 V dc from J5, pin B of the
mounting base enters the power supply adapter through P1, pin B. Power supply adapter P1, pin B
is connected to CB1, which provides over current protection for the A1 module in the power supply
adapter. CR1 is a reverse polarity diode in case the battery voltage is applied incorrectly. A switch S1
is provided to place the power supply adapter in local or remote mode. In local mode the voltage
present at P1, pin B, energizes relay K1. In remote mode, the voltage sent from a AN/VIC 1(V) or
LS 671 loudspeaker to P1, pin E, energizes relay K1.
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