Lesson 4
IDENTIFY THE COMPONENTS AND STATE THE CHARACTERISTICS
AND CAPABILITIES OF RADIO SET AN/GRC-213
OBJECTIVE
After completing this lesson, you will be able to identify the components and state the characteristics and
capabilities of radio set AN/GRC-213.
REFERENCES
This lesson is based on the contents of TM 11-5820-923-12 and other materials approved for US Army
instruction. However, development and progress render the text continually subject to change. Therefore, base
your examination answers on material presented in this lesson rather than on individual or unit experience.
18. INTRODUCTION. In this lesson, you will learn the components, characteristics, capabilities, and
equipment needed for operation of the radio set AN/GRC-213.
a. The AN/GRC-213 is a lightweight (50 lbs), low-power, HF radio set. It is used to provide you with
reliable long-range communications for your wheeled or tracked vehicles. The AN/GRC-213 uses the AN/PRC-
104A radio set (minus the battery pack) with an amplifier-power supply (AM-7152/GRC-213) to provide this
vehicle-mounted system. The amplifier-power supply is connected to the vehicle power source through an
electrical power cable CX-4720. The AM-7152 filters and conditions the vehicle power for the radio set. It also
amplifies and squelches the audio output to drive an external speaker (LS-454) and provides connection for
AN/VIC-1 intercom. Figure 8 will show you what the radio set looks like. It gives you a front and rear view of
the radio set. Figure 9 shows you a front and rear view of the mount with SA-2365 antenna coupler attached.
b. The AN/GRC-213 is designed for ease of installation and removal from the mount. The latches are
all quick-release and the connectors are all push-and-twist- or screw-type connectors. The AN/GRC-213 uses the
same audible indicators as the AN/PRC-104A. The only lighted indicators you have are the power indication
light on the AM-7152 and the frequency light in the RT-1209. You are able to dim these lights for operation
under blackout conditions.
c. In some vehicles, equipment is provided for the amplifier-power supply to interface with the
AN/VIC-1(V) and the very high frequency (VHF) FM radio set that is in those vehicles. This allows the
capability of automatic retransmission. This capability will allow any remote HF SSB radio set to transmit to and
receive from any remote VHF FM radio set through the AN 'GRC-213. AN /VIC-1(V), and VHF FM radio sets.
This also will allow a remote VHF FM radio set to transmit to or receive from any remote HF SSB radio set
through the VHF radio sets AN/VIC-1(V) and AN/GRC-213.
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