Table 4-12. MODULE TEST SET, MICROPHONE AMPLIFIER/LAMP BRIGHTENER MODULE TEST

TM 11-5895-1141-34

Step

Operation

Normal Indication

All module test set controls must be pre-

set according to the procedure in

paragraph 4-10.

Set METER SCALE to 35 mv/-30 dB. Adjust

OSCILLATOR LEVEL to -35 dBm.

Set 20 dB ATTENUATOR switch to IN. This

does not change meter reading signifi-

cantly, but the input signal at T1201 in

microphone amplifier is reduced to

-55 dBm. Set 600 Ω DUMMY LOAD to OUT.

Set METER SCALE to 1.1 v/O dB; OUTPUT

Observe the red and green lamps of the selec-

SELECT to XMTR AUDIO; LOCK/NONLOCK switch

tor module. They should come on brightly.

to LOCK; P/T KEY switch to ON.

Verify that they become dimmer as the LAMP

BRIGHTENER control of the associated selector

module is rotated counterclockwise, but still

glows distinctly even at the CCW limit.

a. If a high degree of amplifier regula-

The regulation level (R1218) adjust is posi-

tion is desired, the input level (R1202)

tioned for an output reading of between

and output level (R1230) adjustments

-5 dBm and 0 dBm, dependent on the installa-

should be at their maximum clockwise

tion and site requirements.

position.

If the meter reading increases by more than

3 dB, R1218 should be adjusted to reduce the

increase to no more than 3 dB.

4-35