Sectionalization Tests Using AN/UPM-137A

NOTE

If the ACCEPT lamp does not go on, it is possible that the mode 4 reply from the AN/TPM-25A is

arriving too late for the timing of the transponder test set. To check this, continue as above, while

slowly turning 269 s gate adjust A2R2 slowly clockwise until the ACCEPT lamp glows. lf the

ACCEPT lamp glows, the performance standard in step 8 has been met. Perform the adjustment

procedure for the 269 S gate as described in paragraph 5.1-22.

e. Sectionalization Tests Using AN/UPM-137A.

Control settings

Test equipment

Equipment under test

Step

Normal indication

Procedure

AN/UPM-137A

FUNCTION: SYSTEM

a. None.

a. Apply power to equipment and

MODE: 4

permit 5 minutes warmup.

(oscilloscope

b. Connect multimeter dc probe to

b. +5 0.1 volt.

DIR RAD: RAD

HORIZONTAL SYNC: EXT DC

A3TP1 (fig. 5.1-1 ). Observe

H O R I Z O N T A L TIME/DIV: 10

SEC

voltage indication.

ISLS: OFF

DISPLAY-CHAN A/ALT CHAN B:

CHAN A

VERTICAL CHAN A-75

IN/OUT: OUT

VERTICAL CHAN A-AC/DC: DC

VERTICAL CHAN A-VOLT DIV:

Same as step 1 . . . . . . . . . . . . . . . . .

AN/APM-27(W)

a. Connect equipment as shown in

a. None.

figure 5.1-7.1. Apply power to

CONSECUTIVE REPLIES: 64

test set, AN/APM-270(V), and

REPLY MODULATION SPAC-

ING PULSE 2:0

A N / U P M - 1 3 7 A and permit

REPLY MODULATION SPAC-

15-minute warmup.

ING PULSE 3:0

b. Press test set PUSH TO TEST

b. Test set should indicate AC

SYNC GAIN: Midposition

switch and turn to LOCK

CEPT.

SYNC DELAY: MidPosition

position.

REPLY MODULATION 1X-2X:

AN/UPM-137A

(interrogator signal

simulator

OUTPUT ATTEN 0-100 dBm: 6

TRANSMITTER XMTR FREQ:

XTAL

TRANSMITTER CW SOURCE:

EXT 1090 MHz