POWER AMPLIFIER MODULE A8

TO 31R2-2GRC171-2

TM 11-5820-815-14

NAVELEX 0967-LP-544-5010

1-16. POWER AMPLIFIER MODULE A8. The power

squelch, modulation, and headset volume along with

amplifier module contains a modulator circuit and rf

jacks for a headset and microphone. In addition, the

driver and power amplifier circuits with automatic load

chassis front panel contains a local-remote switch and all

control. The power amplifier amplitude modulates

the controls necessary for local frequency select,

transmit rf from the synthesizer module with transmit

transmitter keying, and squelch on-off.

audio from the audio module to provide transmit rf to the

rf filter module.

1-20. LEADING PARTICULARS.

1-17. KEYER MODULE A9. The keyer module contains

1-21. Table 1-1 lists the leading particulars of Radio Set

a keyer circuit that converts remote voltage, current, or

AN/GRC-171.

audio loop keying into remote keying to the transmit

keying circuit of the audio module. In addition, the keyer

1-22. CAPABILITIES AND LIMITATIONS.

module contains a squelch operated relay circuit.

1-23. Table 1-2 lists the capabilities and limitations of

1-18. CHASSIS AND FRONT PANEL A10. The chassis

Radio Set AN/GRC-171.

contains all connectors, wires, and coaxial cables

necessary to interconnect the nine modules of the

1-24. EQUIPMENT SUPPLIED.

receiver-transmitter. In addition, the chassis contains an

emi filter that filters all wires that enter or leave the

1-25. Table 1-3 provides a list of equipment supplied,

receiver-transmitter. The chassis contains power supply

together with dimensions and weight.

components that convert input ac power into unregulated

dc voltage to the dc-dc converter module.

1-26. EQUIPMENT REQUIRED BUT NOT SUPPLIED.

1-19. The chassis front panel contains the power on-off

1-27. Table 1-4 lists the test equipment required to

switch, power supply fuses, a meter circuit and test

maintain Radio Set AN/GRC-171. Equivalent test

points, level controls for receive audio, sidetone,

equipment may be used. Refer to table 5-1 for test

equipment test characteristics.

Table 1-1. Leading Particulars (Sheet 1 of 2)

ITEM

DESCRIPTION

Power source

95 to 132 V ac; 189 to 264 V ac; 47 to 63 Hz; 380 to 420 Hz; single-phase.

Primary power

NOTE

Primary power strapping is provided for ac line voltages of 105, 120, 210,

and 240 V ac +10%. The AN/GRC-171 is shipped strapped for 120 V ac.

Emergency power

24-V dc battery.

NOTE

A 24-V dc battery bus may be floated across the dc input to the RT-

980/GRC-171 to provide emergency power in the event of an ac power failure.

The switch over to battery power is automatic.

Alternate power

22 to 30 V dc.

NOTE

In place of ac power, the AN/GRC-171 may be operated from a dc power

source of 22 to 30 V dc. The AN/GRC-171 is capable of rated performance while

being operated on dc power.

1-3