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 TM 11-6625-667-451 NAVAR 16-30APM123-2/TO 33A1-3-367-22
lights.
Set
should be connected to the test point indicated.
ACCEPT indicator just
The Control column indicates the control to be
AN/TPM-25A SUM ATTEN dial for a reading of
adjusted, and the Limits s column indicates the
6 dB less the 1090 MHz loss of cable 139526.
requirements. The decoder reply evaluator ad-
e. Decoder Adjustments. The chart below lists
justment procedure is given in f below.
the decoder adjustments. The oscilloscope probe
Adjustment
Test Point
Limit us
Control
Video enable delay (DSS4).
A10R7
A10TP5
1.8 0.2
Video pulse width (DSS1).
A11R6
A1lTP1
0.7 +0.0
-0.05
Line drive generator (ISS1).
A4R6
A4TP1
0.6 0.01
Accept reject pulse width (DSS3).
A11R30
A11TP3
0.350.01
f. Reply Evaluator Adjustment.
the REPLIES SUB PULSE POS VARY control
(1) Set the ME-26B/U SELECTOR switch
until the ME-26B/U indication is 65% of that
at (+) and RANGE switch at 10V. Connect the
noted in (4) above.
common lead to test point A13TP2 (ground and
(6) Adjust control A12R19 until the AC-
the dc probe to test point A12TP2.
CEPT and REJECT indicators are continually
( 2 ) Set the AN/TP25A REPLIES SIF
alternating indications (intermittent).
REPLY CODE switches to 7767.
(7) Repeat the procedures in (2) through (5)
(3) Adjust the ME-26B/U ZERO ADJ. for a
above.
zero meter indication.
( 8 ) Adjust the AN/TPM-25A REPLIES
(4) Set the AN/TPM-25A REPLIES SIF
SUB PULSE POS VARY control until the
REPLY CODE switches to 7777. Note the
ME-26B/U indication is 50% of that noted in (4)
ME-26B/U indication.
above. The REJECT indicator should be on.
(5) Set the AN/TPM-25A REPLIES SUB
Repeat the adjustment until the indication is
PULSE SEL control to the Cl pulse position and
80% of the noted voltage. The ACCEPT indicator
REPLIES SUB PULSE POS to VARY. Adjust
should be on.
Change 5 4-9
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