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Page Title:
Sectionalization Tests using AN/TPM-25A-CONT. |
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 Control Settings
Step
Normal indication
Procedure
Equipment under test
Test equipment
No.
a. F i f t h p u l s e p o s i t i o n i s
a. Set transponder test set ISLS
5
occupied.
switch to ON. check for isls pulse
in fifth pulse position.
b. 8 0.7 s
b. Measure pulse spacing, leading
edge to leading edge, between the
first pulse and isls pulse.
c. 0.5 0.1 s
c. Measure isls pulse width.
d. Pulse amplitude decreases.
d. set transponder test set ISLS
switch to OFF. Check that isls
pulse decreases in amplitude.
6
a. None.
a. Connect equipment as shown in
AN/TPM-25A
Continually press and release
figure 5.1-11, except connect
REPLIES SUB PULSE
SEL:
PRESS TEST switch to observe
A N / T P M - 2 5 A REPLY VID
M4-P2
specified conditions.
OUT to AN/USM-281A A
REPLIES SUB PULSE
POS:
INPUT.
VARY
b. O n A N / T P M - 2 5 A , a d j u s t
b. 1.7 s min,
REPLIES SUB PULSE POS
1.9 s max.
VARY control counterclockwise
until REJECT lamp glows, and
then clockwise until ACCEPT
lamp just goes on. Measure pulse
spacing from leading edge of first
pulse to leading edge of second
pulse
c. On AN/TPM-25A, set replies SUB
c. None.
PULSE SEL to M4-P3.
d. Repeat step b above and measure
d. 3.5 s min,, 3.7 s max.
pulse spacing from leading edge
of fiat pulse to leading edge of
third pulse.
7
AN/TPM-25A
a. Same as step 6a above.
a ACCEPT lamp glows.
REPLIES
SUB PULSE SEL OFF
Same as step 6.
b. On AN/TPM-25A, sat REPLIES
b. REJECT lamp gbws.
REPLIES
SUB PULSE POS: 0
GATING PASS to 55 and then
REPLIES
GATING PASS:56
to 54, and REPLIES GATING
REPLIES
GATING INHIB: 08
INHIB to 09 and then to 10,
respectively.
8
Same as step 6, except set DIR/
a. Same as step 6a, above.
AN/TPM-25A
a. ACCEPT lamp glows (See
RAD switch to DIR.
note
REPLIES GATING PASS: 16
REPLIES GATING INHIB: 48
b. On AN/TPM-25A, set REPLIES
b. REJECT lamp glows.
GATING PASS to 15 and then
14, and REPLIES GATING
INHIB to 49 and 50, respec-
tively.
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