The Radio Set AN/GRC-160 is designed for use in vehicles, and it uses the same radio (RT-841) as the AN/PRC-77. An AM-2060 amplifier provides operating voltage to the RT-841/PRC-77 and, also, has a self-contained loud speaker that amplifies the signal received. The installation kits are provided for specific vehicles and are permanently installed in the vehicles.

Figure 11-3.-Amplifier-Power Supply AM-2060/GRC and Receiver-Transmitter, Radio RT-505/PRC-27, 77.

Figure 11-4A.-Receiver-Transmitter 841 for Radio Set AN/GRC-160.

Figure 11-4B.-Amplifier AM-7060 for Radio Set AN/GRC-160.

Figure 11l-4C.-Mounting MT-1029/URC for Radio Set AN/ GRC-160.

To operate the radio, follow these steps. (The numbers of Steps 1 through 10 below are keyed to the numbers on the diagram shown in figure 11-3.)

1 Attach Cable CX-4665/GRC between the power connectors (SET POWER).

2 Attach the antenna cable to the antenna connector (ANT).

3 Attach Handset H-189/GR (fig, 11-1) to either audio connector (AUDIO).

4. Turn the band switch to the desired operating frequency band.

5. Turn the MHz tuning and the kHz tuning control knobs until the desired frequency appears in the channel dial. (5A: REC-TRANS FREQUENCY).

6. Set the antenna frequency control to match the frequency appearing in the charnel dial (5A).

7. Turn the power switch to PWR ON.

8. Turn the speaker switch to SPKR ON.

9. Turn the volume control to 4.

10. Turn the function switch to ON.

11. Press Handset H-189/GR (fig. 11-1)

12. PUSH-TO-TALK switch (on the right side of the handset) and speak into the handset.

13. Release the PUSH-TO-TALK switch to LISTEN.

Adjust the VOLUME control (1 O) for a desirable sound level.

To reduce the rushing noise when no signal is being received, turn switch (10) to SQUELCH. Figures 11-4A, 11-4B, 11-4C, and 11-4D present the components of the AN/GRC-160.

Figure 11-4D.-Antenna AT-912/URC for Radio Set AN/ GRC-160.