Section VI. ALIGNMENT AND ADJUSTMENTS

TM 11-5820-509-35

NOTE

(5) Connect the b us wire from the t/r relay to

Rotate the frequency control knobs

the ANTENNA connector (bowl insulator).

on the front panel of the receiver-

(6) Install the power amplifier tube using the

transmitter to obtain a KILOCYCLES

procedure detailed in paragraph 3-14c.

indicator reading of 2000; then orient

(7) Replace the cover and rf gasket over the

the rotors of switch wafers (19) and

power amplifier tube access hole; secure in place with

(26) as shown in figure 391 before

four 8-32 x 1/2 flat head screws.

tightening the setscrews in the shaft

(8) Solder the wires to POWER 20A DC and

collar.

POWER 5A AC fuses, to the four panel lamp-, and to

XMTR OUTPUT meter.

(11) Install the access cover and gasket over

(9) Install BATTERY TEST pushbutton and

the power amplifier plate capacitor access hole and

CW-FSK/VOICE switch and secure each in place with

secure it in place with the four 6-32 x 3/8 flat head

the hex nut (boot).

screws. Do not damage the gasket used with this cover

(10) Refer to figure 3-91. Install 6-32 x I/2 flat

during installation.

head screws (1) and (3) into spacers (5) and (11) of the

(12) Perform steps (21) through (30) of the

power amplifier plate capacitor switch and tighten them

power amplifier load and tune mechanism procedures

securely; then install fiber shaft (2), panel bushing (6),

detailed in paragraph 3-15c.

washer (7), spur gear (8), and shaft collar (9) into the

switch assembly.

(13) If all repairs are complete, install the top

and bottom covers on the power amplifier compartment

using the 4-40 screws (11 per cover).

Section VI. ALIGNMENT AND ADJUSTMENTS

3-20. Test Equipment and Special TOOTH Required for Alignment and Adjustments

e. Frequency Counter AN/URM-79/U. A frequency

a. The following test equipment and special tools

are required for alignment and adjustments of Radio Set

counting device used to establish the exact operating

AN/PRC-47. Each type of test equipment is discussed

frequency of the signal generator.

below to point out its characteristics and use.

f. Audio Oscillator TS-382/U. An audio oscillator

with a range of 20-to 200,000-Hz and a maximum

Item

Technical manual

output of 100 milliwatts. Used as a signal source for

audio inputs for transmitter tests.

Multimeter ME-26A/U

TM 11-6625-200-15

g. Dummy Load DA-75/U.

A 50-ohm rf bad

Oscilloscope AN/USM-50

TM 11-5129

capable of dissipating 500 watts of rf power without

Signal Generator SG-103/URM-25F

external cooling. Used to terminate the transmitter

Frequency Counter AN/URM-79/U TM 11-6625-935-12

output during transmitter tests.

Audio Oscillator TS-382/U

h. Output Meter TS-585/U. A calibrated output

Dummy Load DA-75/U

indicating device with adjustable load. Used during

Cable Assembly Set AN/PRA-4

measurements of audio output during receiver tests.

Output Meter TS-585/1)

i. Cable Assembly Set AN/PRA-4. An assortment

of extender cables for modules of the Radio Receiver-

b. Multimeter ME-26A/U.

A vacuum-tube

Transmitter RT-671/PRC-47, special test cables, and a

voltmeter used for general-purpose measurements.

special whip antenna simulator. Used whenever a

c. Oscilloscope AN/USM-50. A visual display used

module must be operated while removed from the main

for low-level measurements and audio waveform

chassis of the receiver-transmitter, and during

studies.

evaluation tests. The whip antenna simulator provides a

d. Signal Generator SG-103/URM-25F. A 10-kHz

miniaturized antenna system for bench testing the

to 50-MHz signal generator used to provide intermediate

transmitter.

frequency test signals for receiver evaluation tests.

3-116