Section II. PERFORMANCE TESTS

TM 11-5820-509-35

Section

Action required

Reference standard

Record output of 560 - 750-kHz filter.

At A7J4, from 575- to 725-kHz, 0.6 to 1.0 volt pep; at 650 and

775 kHz, 0.7 volts p-p. maximum, and at 500 and 800 kHz,

0.2 volts pep maximum.

(a) At A7J5, not less than 4.0 volts dc from 650 to 700

Record frequency discriminator operation.

kHz; A7J6 not more than 1.5 volts for same

frequencies. At A7J5, not more than 1.6 volts dc

from 700 to 750 kHz; A7J6 not less than 4.0 volts for

same frequencies.

(b) At A7J5, not less than 4.0 volts dc from 600 to 650

kHz; A7J6 not more than 1.5 volts for same

frequencies. At A7J5, not more than 1.5 volts dc

from 660 to 700 kHz; A7J6 not less than 4.0 volts for

same frequencies.

kHz; A7J6 not more than 1.5 volts for same

frequencies. At A7J5, not more than 1.5 volts dc

from 600 to 650 kHz; A7J6 not less than 4.0 volts for

Adjust error voltages.

same frequencies.

Select R144 to provide balanced 10 kHz modulation levels at

Verify

successful

antilock

circuit

the output circuits of Q9 and Q12.

operation.

ANTI-LOCK lamp operates satisfactory and A7J4reads 1.05

volts pep.

Record SMO mixer output.

At A7J4, 1.5 0.4 volts pep throughout tuning range of

equipment.

Section II. PERFORMANCE TESTS

6-9. General

CAUTION

This section contains the tests and performance data

Before

connecting

the

power

required to determine whether the repaired equipment

supplies to the test fixture, set their

meets

the

original

performance

requirements

output voltages to 24.0 2.0 volts

established for Radio Set AN/PRC-47.

and -7.0 0.5 volts respectively.

6-10. Audio Frequency Amplifier AM-3506/PRC-47 (A8A1)

Then return the power on-off switch

(Fig. 7-15)

to off until instructed to apply

a. Test Equipment and Material.

primary power to them.

(1) Audio Oscillator TS-382/U

(1) Connect the audio oscillator, frequency

(2) Distortion Analyzer TS-723/U

counter, output meter and the two power supplies to the

test fixture as shown in figure 6-11. (The connections

(3) Frequency Counter AN/URM-79/U

for the remaining test equipment are detailed in the

(4) Loudspeaker LS-166/U (or Headset H233)

appropriate procedural steps below.

from AN /PRC -47

(2) Remove the dust cover from the module,

(5) Multimeter ME-26A/U

set all potentiometers to mid-range ill turns from either

(6) Oscilloscope AN/USM-50

end), and carefully insert the module into connector J1

(7) Output Meter TS-585/U

on the test fixture.

(8) Power Supply (24 volts dc!, Harrison

(3) Apply primary power to all test equipment

6202B, or equal

and turn on the power control switch of each unit.

(9) Power Supply (-7 volts dc), Harrison

Immediately adjust the output of the 24 volts power

6203B or equal

supply to 24.0 0.5 volts dc and then place the POWER

(10) Test fixture for AM-3506/PRC-47 (fig. 6-4)

switch of the test fixture to ON.

(11) Voltmeter ME-30A/U

(4) Place the +20 V - +24 V switch to the +20

b. Test Conditions and Equipment Connections.

V position and observe that the MODULE CURRENT

meter reads approximately 25 ma. Place the switch to

+24 V and note the MODULE CURRENT indication is

approximately 55 ma.

6-13