Chapter 5. MAINTENANCE - TM-11-5820-815-140099

TO 31R2-2GRC171-2

TM 11-5820-815-14

NAVELEX 0967-LP-544-5010

CHAPTER 5

MAINTENANCE

INTRODUCTION

This chapter provides maintenance instructions for uhf

This chapter presupposes that maintenance personnel

AM Radio Set AN/GRC-171. Section I provides infor-

are thoroughly familiar with the physical makeup and

mation on organizational/intermediate maintenance.

theory of operation of Radio Set AN/GRC-171.

Section II provides special maintenance procedures.

SECTION I

ORGANIZATIONAL/INTERMEDIATE

MAINTENANCE

AN/GRC-171. Equivalent test equipment may be used.

5-1. GENERAL.

Audio test fixture (figure FO-34) may be used to facilitate

connecting test equipment to the RT-980/GRC-171.

5-2. This section contains all maintenance instructions

necessary for the organizational or intermediate

5-5. TEST POINTS.

maintenance technician.

5-6. Table 5-2 lists all test points and provides a

5-3. MAINTENANCE TEST EQUIPMENT.

functional description for each test point. Refer to

figure 5-1 for test point location.

5-4. Table 5-1 lists the recommended test equipment

required for checkout and maintenance of Radio Set

Table 5-1. Test Equipment Required (Sheet 1 of 3)

TEST EQUIPMENT

TEST CHARACTERISTICS

RF Generator/Frequency Counter

AN/USM -323

Frequency Range: 225 to 400 MHz, 0.0015 MHz.

Output level: 3.0 V to 1.0 V.

Modulation level: 30 to 90%.

Modulation frequency: 400 to 10,000 Hz.

Frequency counter: 225 MHz 1125 Hz to 399.975 MHz

2000 Hz.

Boonton RF Voltmeter Model 91DA

0 to 30 0.6 mV rms, 0 to 30 0.06 V rms.

Frequency range: 10 to 400 MHz.

5-1