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Page Title:
Mode 4 Reply Decoder Tests-CONT. |
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 Control Settings
Step
No.
Test Equipment
Equipment under test
Test Procedure
Performance Standard
4
REJECT indicator glows.
Set AN/TPM-25A M4 JAMMING to
1. Depress transponder test set
PRESS , TO TEST switch.
REJECT indicator should glow.
AN/TPM-25A
5
a. None
a. Continually depress and release
REPLIES panel
PRESS TO TEST switch, and,
GATING INHIB: 00
on AN TPM-25A, turn
GATING PASS: 00
REPLIES SUB PULSE POS
M4 JAMMING: 0
VARY control counter clockwise
SUB PULSE SEL: M4-P2
until REJECT' indicator glows,
SUB PULSE POS: VARY
and then clockwise until AC-
AN/USM 281A4
CEPT indicator just goes on.
Sweep display switch DELAYED
b. 1.65
max
MAIN TIME/DIV: .1 MSEC
AN/USM-281A B INPUT and
DELAYED TIME/DIV: 1
the reply video pulses on A
EXT 10/EXT/INT/LINE:
INPUT. Measure spacings from
EXT
leading edge of first pulse of
INT AUTO/'EXT/EXT 10
leading edge of second pulse.
AUTO
c. 1.85
max
c. Repeat steps a and b above, except
MAIN - SLOPE +: +
turn REPLIES SUB PULSE
DELAYED SLOPE +: +
SEL control clockwise first.
MAIN ACS/ACF/AC/DC: DC
d. 3.45
max
d. On AN/TPM-25A, set REPLIES
DIV DELAY: 0.82
SUB PULSE SEL to M4-P3,
DISPLAY:ALT
repeat steps a, b, and c above,
A VOLTS/DIV: .5
and measure spacing between
B VOLT/DIV: 5
leading edge of first pulse and
3.75
max
leading edge of third pub.
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