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Page Title:
Sectionalization Test Using AN/TPM-25A-cont. |
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 Paragraph
Normal Indication
Procedure
reference
Equipment under test
Step
Test equipment
DISPLAY: ALT
A and B VOLTS/DIV: 5
(Cont)
A and-B-POLARITY:
+ UP
A and B AC/GND/DC:
DC
a. None.
a. Perform system timing setup step
AN/TPM-25A
5
Same as step 4.
4 above.
POWER ON
b. None.
MEASUREMENT
test, turn off transponder test set
FUNCTION SEL: FREQ
and connect equipment as shown in
REPLIES MODULATION
SEL:OFF
c. None.
c. Turn off transponder test set and
REPLIES SUB PULSE
allow two minutes warmup.
SEL: OFF
d. None.
d. On AN/USM-281A, adjust DIV
RANGE DELAY SEL: 0100
DELAY to position the center (1030
PRT
SEL
(USEC):
MHz marker on the center vertical
Immaterial
graticule.
TRIP SEL INT DCD/
e. None.
adjust
AN/TPM-25A,
e. O n
EXT: EXT
SIG GEN FUNCTION:
MEASUREMENT FREQ MEA!
SWP
5
MHz
control for maximum amplitude o
AN/USM-281A
either of the pulses displayed on the
POWER: ON
scope.
f. 1030 MHz* 206 kHz.
Sweep display switch:
MAIN
the pulse reaches its maximum
amplitude by comparison of its
MAIN TIME/DIV: .1 MSEC
position with respect to 1030, 1030
INT/AUTO/EXT/EXT
1, and the 1030 5 MHz markers.
10: AUTO
EXT10/EXT INT LINE:
EXT
MAIN - SLOPE +:+
DISPLAY: ALT
B VOLTS/DIV: 2
A VOLTS/DIV: 5
A and B POLARITY: + UP
A and B AC/GND/DC:
DC
6
TS 779A/U
Same as step 4
CAUTION
BOLO BIAS CURRENT:
The bolo bias current switch
OFF
must be in the OFF position
BOLO RES: 200
the
before
connecting
BOLO TEMP COEF: NEG
the
MX-2144A/U to
TS 779A/U.
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