Initial Settings and Adjustments. - TM-11-5820-509-350215

TM 11-5820-509-35

(5) Adjust the output of the -7 volts power

(7) Set the IMPEDANCE switch on the output

meter to 300 OHMS, and adjust the meter multiplier for

supply using the SIDETONE GATE TEST jack (J3) and

the SIDETONE GATE ADJUST control on the test

5000 milliwatts full scale.

fixture. The reading at J3 must be set to -7.0 0.2 volts

NOTE

dc. Then place the power control switch on the -7 volts

Perform the initial adjustments and

power supply to off.

each of the following tests in the

(6) Permit the test equipment and the module

order listed to avoid erroneous test

to stabilize for at least 5 minutes before beginning the

results or maladjustment of the

following procedures.

module gain settings.

Figure 6-11. Audio Frequency Amplifier AM-3506/PRC- 47 (A8A 7 ) Performance Tests, Initial Test Equipment

Connections

c. Initial Settings and Adjustments.

(5) Reduce the output level of the audio

oscillator to 0. Reset it to 0.010 0.002 volt rms at

(1) Set the audio oscillator output frequency

MIKE AMPL IN jacks (J5 and J11) and adjust

to 1700 Hz and adjust the output level to 0.1 volt rms at

potentiometer R40 (fig. 3-94) until the VOX ON lamp

RCVR AUDIO IN jacks (38 and J14).

(DS2) on the test fixture lights

(2) Observe the output meter and adjust

(6) Move the oscilloscope input to RCVR

receiver gain control R54 (fig. 3-94) until the meter

AUDIO OUT jacks (J7 and J13). Energize the- 7 volts

reads 1.0 watt output (18.0 volts rms) at RCVR AUDIO

dc power supply and reset SIDETONE GATE ADJUST

OUT jacks (J7 and J13).

control for -7.1 0.1 volts dc at SIDETONE GATE

(3) Move the audio oscillator and the

TEST jack (J3), if necessary. Increase the output level

frequency counter to MIKE AMPL IN jacks (J5 and J11).

of the audio oscillator to 0.1 volt rms at 1700 Hz.

reset the output level of the audio oscillator to 0.1 volt

(7) Adjust potentiometer R46 (fig. 3-94) until

rms at 1700 Hz, if necessary.

an oscilloscope deflection of 20 volts peak-to-peak is

(4) Connect the oscilloscope to MIKE AMPL

observed. Be sure that the waveshape is symmetrical

OUT jacks (J6 and J12). Place the PTT switch of the

(not clipped).

test fixture to ON and adjust microphone amplifier gain

d. Maximum Output Levels, Receive Mode.

control R27 (fig- 3-94) until a deflection of 3.5 volts

peak-to-peak is observed on the oscilloscope.

(1) Turn off the -7 volts dc power supply by

6-14