Audio Response Test (X-Mode) at 1 kHz

TM 11-.5820-401-34-3/0967-LP-432-3060

5-9. RECEIVER AUDIO RESPONSE TEST (X-MODE). (CONT)

2. Disconnect T-connector from AN/USM-207.

3. Set AN/USM-207 controls to the following positions:

POSITION/SETTING

CONTROL/SWITCH

TRACK

POWER

MIN (fully counterclockwise)

DISPLAY

0.1 v

SENSITIVITY

1 (black knob)

GATE TIME

FREQ

FUNCTION

Disconnect rf cable from Adapter UG-514. (See test setup diagram

, page 5-26.)

Connect rf cable to AN/USM-207 FREQ A connector.

Adjust AN/URM-127 FREQ RANGE DIAL for 1-kHz display on AN/USM-207.

Disconnect rf cable from AN/USM-207 FREQ A connector.

Reconnect rf cable to Adapter UG-514.

Connect ME-30(*)/U INPUT lead A to Test Cable No. 1 terminal 2; connect lead B to

terminal A. Note meter indication.

STANDARD. ME-30(*)/U meter should indicate at least 0.78 volt.

10. If ME-30(*)/U meter does not indicate at least 0.78 volt, see troubleshooting chart 5-9.

Audio Response Test (X-Mode) at 500 Hz

11.

Turn AN/URM-127 FREQ RANGE DIAL to 50.

12.

Disconnect rf cable from Adapter UG-514. (See test setup diagram

13.

Connect rf cable to AN/USM-207 FREQ A connector.

14.

Adjust AN/URM-127 FREQ RANGE DIAL for 500-Hz display on ANWSM-207.

15.

Disconnect rf cable from AN/USM-207 FREQ A connector.

16.

Reconnect rf cable to Adapter UG-514. Note ME-30(*)/U meter indication.

STANDARD. ME-30(*)/U meter should indicate between + 2db and -3 db of reading noted in

step 9.

17. If ME-30(*)/U meter does not indicate between + 2db and -3 db of reading taken in step 9, see

troubleshooting chart 5-9.

Audio Response Test (X-Mode) at 3 kHz

18.

Turn AN/URM-127 FREQ RANGE MULTIPLIER to x100.

19.

Turn FREQ RANGE DIAL to 30.

20.

Disconnect rf cable from Adapter UG-514. (See test setup diagram

21.

Connect rf cable to AN/USM-207 FREQ A connector.

22.

Adjust AN/URM-127 FREQ RANGE DIAL for 3-kHz display on AN/USM-207.

23.

Disconnect rf cable from AN/USM-207 FREQ A connector.

24.

Reconnect rf cable to Adapter UG-514.

5-28