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 5.2-8 Decoder Tests
a. Test Equipment Required
(1) Test Set, Radar AN/TPM-25A.
(2) Oscilloscope, AN/USM-281A.
(3) Generator, Pulse AN/UPM-15A.
b. Test Connections and Conditions. Perform the system timing setup as described in the chart
in paragraph 5. 2-4c step (1) Then connect the equipment as shown in figure 5.2-3, transmitter
pulse characteristics test setup.
c. Procedure.
Control settings
Equipment under
Test
Performance
Test equipment
Step
procedure
standard
test
a. None.
AN/TPM-25A
1
FUNCTION: SYSTEM
REPLIES panel:
POWER: ON
teat set. Permit a few minutes
warmup.
CODE: 0000
MODULATION SEL: SIF
b. Press the test set PRESS
PRESS-TO-TEST: LOCK
b. None.
REPLY WIDTH:0.45
MODE: 1
SIF REPLY CODE: 0000
TO-TEST switch, and turn to
SUB PULSE SEL: OFF
LOCK.
RANGE DELAY SEL 0100
GATING PASS 00
GATING INHIBIT 00
SIF CHAL VID SIF
MODE SEL OFF
TRIG SEL INT DCD/
EXT: EXT
SIG GEN FUNCTION: FIXED
FREQ
SUM ATTEN: 0 DB
All other switch settings
immaterial.
a. Adjust both the test set and
a. The test set must indicate
2
N/A
N/A
AN/TPM-25A REPLIES SIF
ACCEPT.
N/A
REPLY CODE controls to each
code as follows, and note the test
set readout.
CODE
A
B
D
c
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
4
5
5
5
5
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