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d. Sectionalization Tests Using AN/UPM-98.
Control settings
Procedure
Normal indication
Equipment under test
Test equipment
Step
a. None.
a. Apply power to multimeter and
FUNCTION: SYSTEM
Multimeter
1
transponder test set equipment and
MOD 4
Range: 10V
permit 5-minute warmup period.
DIR-RAD: RAD
Polarity:(+)
b. +5 0.1 volt.
b. Connect equipment with multimeter
ISLS: OFF
dc probe connected to test point
A3TP1 (fig. 5.1-1).
a. Connect equipment as shown in
a. None.
AN/APM-270(V)
2
figure 5.1-7. Apply power to RF
CONSECUTIVE REPLIES: 64.
power teat set and signal generator.
SPACING PULSE:2:0
Permit 5-minute warmup period.
SPACING PULSE 3:0
b. None.
b. Apply power to oscilloscope , AN/
SYNC GAIN: Midposition
APM-270(V), and modulator. Per-
REPLY MODULATION
mit 5-minute warmup period.
1X-2X 1X
c. None.
c. Continuously press transponder teat
AN/URM-64A
set PUSH-TO-TEST switch so that
FUNCTION: CW
it is alternately on, then off, then
OUTPUT ATTENUATOR
on etc.
Fully clockwise
d. None.
d. Adjust signal generator frequency un-
til transponder test set indicates a
solid ACCEPT (frequency approxi-
mately 1,090 mc).
NOTE
If ACCEPT light does not come
On, go directly to step 3.
e. -9 0.1 dBm.
e. Adjust signal generator OUTPUT
ATTENUATOR control counter-
clockwise until test set indicates
REJECT. Then, adjust control
clockwise until test set just indi-
cates ACCEPT. Measure rf level at
modulator RF OUT jack with rf
power test set.
NOTE
Check the power at end of
cable.
f. None.
f. Increase signal generator output level
3 dB above value noted in e above.
a. None.
a. Disconnect cable at modulator RF
AN/USM-281A
3
OUT jack and connect cable to RF
HORIZONTAL MAGNIFIER: XI
IN jack of AN/APM-270(V).
HORIZONTAL DISPLAY INT
b. None.
b. Conmect oscilloscope CHANNEL A to
Main VERNIER: Fully
DET VIDEO jack of AN/APM-
clockwise
270(V).
Main TIME/DIV: 50 sec

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