Section VI. GENERAL SUPPORT TESTING PROCEDURES DURING MODE 4 OPERATION USING AN/TPM-25A AND AN/U PM-137A

TM 11-6625-647-45/NAVAIR 16-30APM123-21T0 33A1-3-367-22

Section VI. GENERAL SUPPORT TESTING

PROCEDURES DURING MODE 4 OPERATION USING

AN/TPM-25A AND AN/U PM-137A

5.1-26 General

the REJECT light does not come on

m o m e n t a r i l y before the ACCEPT

These procedures describe tests for the trans-

light, there is a problem in the 5 volt

ponder test set mode 4 operation. They should be

power supply (Module A3).

performed after repair of module Al, A2, or A3.

Two test procedures are provided for both the

5.1-27 Mode 4 Reply Decoder Tests

Mode 4 Reply Decoder Tests and the Mode 4

a Test Equipment Required

Challenge Video Tests. The first procedure uses

(1) Oscilloscope AN/USM-281A.

conventional test equipment and the Radar Test

(2) Radar Test Set AN/TPM-25A

Set AN/TPM-25A, In the second test procedure,

b. Test Conditions and Conditions.

Radar Test Set AN/UPM-137A is the only piece

(1) Apply power to the test equipment and

of test equipment used.

permit a 15-minute warmup period.

CAUTION

(2) Connect the equipment as shown in figure

When using the test set in Mode 4, if

5.1-34

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