Table 4-12. MODULE TEST SET, MICROPHONE AMPLIFIER/LAMP BRIGHTENER MODULE TEST (Cont'd)

TM 11-5895-1141-34

Step

Operation

Normal Indication

b. If no amplifier regulation was

The meter reading should be at least +10 dBm.

desired, the jumper between E21 - E22 may

have been removed. If this is so, the

regulation level (R1218) should be rotated

fully clockwise. Flip the 20 dB ATTENUA-

TOR switch to OUT.

c. Regulating action other than the

extremes described above (5a, 5b) may be

required to suit a particular operating

environment. If so, adjustments should be

made in accordance with procedures estab-

lished by authorized personnel.

Press the XMTR LOAD switch.

Observe the meter reading. It should not

drop more than 3 dB.

The microphone input should be unchanged

The meter reading (sidetone signal) should be

-25 2 dBm.

(-55 dBm). Set the HEADSET VOLUME control

fully clockwise. Set the INPUT SELECT

switch to HEADSET and METER SCALE to

0.11 v/-20 dB.

The meter reading should be -10 2 dBm.

Set METER SCALE to 0.35 v/-10 dB and the

OUTPUT SELECT switch to MIXER ATIPL

Return all test set switching and controls

to the initial positions indicated in

paragraph 4-10.

4-36