OPERATE RADIO SET AN/GRC-213
After completing this lesson, you will be able to operate radio set AN/GRC-213.
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.
27. INTRODUCTION. During this lesson, you will learn the presets that you as the operator of radio set
AN/GRC-213 will be required to perform. You also will learn the procedures needed to successfully operate this
radio set. This will include some of the operational considerations that you should look at when you are required
to operate the radio in the field.
OPERATOR'S CONTROLS AND INDICATORS.
a. Before you can make any of the presets that are required, you need to know what the controls and
indicators are and their functions. Table 8 lists for you the controls and indicators and what their functions are.
Figure 13 will show you the location of these controls and indicators. The letters with arrows pointing to the
control or indicator correspond to the reference key in Table 8.
b. There also are some audible indicators that you should already be familiar with. These were
described for you in Lesson 2. To refresh your memory, the audible indicators that will be heard in your handset
are as follows:
Low power indication - clicking sound in the handset
Power output indication - sidetone in the handset.
Tuning indication - 1-kHz tone in the handset.
No tune indication - a continuous beeping that is heard in the handset.
VSWR mismatch indication - a short beep at beginning of transmission.
Tune indication - 1-kHz tone for 3 to 12 seconds.
29. ENVIRONMENT. Another thing that must be considered before operating is your operational environment
Section II of TM 11-5820-919-12 discusses the operational considerations. These considerations enable you to
make your site selection, frequency selection (if this decision is left up to you), and so on. These will affect some
of the presets that you have to make.