Figure 7.1-1. Depot system timing setup using AN/TPM-25A.

TM 11-6625-667-45/NAVAIR 16-30APM123-2/TO 33A1-3-367-22

Control

Position

g. Adjust the AN/UPM-15A PULSE DELAY

M4 JAMMING

as required to position the delayed pulse ap-

PRT SEL( SEC)

Immaterial

proximately .5 ms before the trailing edge of the

TRIG SEL INT DCD/EXT

EXT

prf pulse. Continue adjustment as necessary until

SIG GEN FUNCTION

FIXED

the transponder test set ACCEPT lamp is on.

FREQ

NORM

h. Without disturbing any equipment setting,

SUM ATTEN

-6dB

shut all equipment off and connect the test

MEASUREMENT FUNCTION SEL

PWR

equipment as shown in figure 7.1-2, depot

e. Turn on the AN/TPM-25A, AN/UPM-15A,

overhaul standards basic test.

AN/USM-182, and the transponder test set.

i. Turn all equipment on and note that trans-

f. On the AN/USM-182, observe the positive

ponder test set ACCEPT lamp is on.

going 2.17 ms prf pulse from A5TP5 and the

delayed prf pulse from the AN/UPM-15A.

Figure 7.1-1. Depot system timing setup using AN/TPM-25A.

7.1-2

Change 5