 |
|||
|
|
|||
|
Page Title:
Receiver Section and Decoder Section Adjustments Using AN/ UPM-137A |
|
||
| ||||||||||
|
|
 TM 11-6425-667-45/NAVAIR 16-30APM123-2/TO 33A1-3-347-22
SELECT control to the Cl pulse position. Adjust
steps 9a through d of the chart in paragraph 3-4e.
t h e SUB PROBE POS control until the
T h i s establishes the test conditions for all
ME-26B/U indication is 65 percent of that noted
receiver and decoder adjustments.
in (4) above.
NOTE
(6) Adjust control A12R19 until the AC-
Disregard the specified measurements
CEPT and REJECT Indicators are continually
and the normal indication columns in
alternating indications (intermittent.
the chart.
(7) Repeat the procedures (2) through (6)
c. Receiver Sensitivity A d j u s t m e n t . S e t
above.
A N / U P M - 1 3 7 A signal generator OUTPUT
(8) Adjust the AN/UPM-98 SUB PULSE
A T T E N 0-100 dBm to - 8 . 1 dBm plus at
POS control until the ME-26B/U indication is 50
tenuation marked on cable connected to test set
percent of that noted in (4) above. The REJECT
PROBE jack. (Example: -8.1 plus -0.9 equals
indicator should be on. Repeat the adjustment
9). Adjust control A8R5 (fig. 3-7) completely
until the indication is 80 percent of the noted
C C W. Then, turn the control until the ACCEPT
voltage. The ACCEPT indicator should be on.
and REJECT indicators are alternately lighting.
d. Decoder Adjustments. The chart below lists
4-5.1. Receiver Section and Decoder
the decoder adjustments. The AN/UPM-137A
Section Adjustments Using AN/
oscilloscope VERTICAL-CHAN A--VIDEO
UPM-137A
IN jack should be connected to the test point
a. Test Equipment Required. Radar Test Set
indicated. The Control column indicates the
AN/UPM-137A is required.
control to be adjusted, and the Limits column
b. Test Setup.
indicates the requirements. The decoder reply
evaluator adjustment procedure is given in e
below.
(2) Adjust the equipment as specified in
Limits sec
Adjustment
Control
Teat point
Video enable delay (DSS4)
A10R7
Al0TP5
1.80.2
Video pulse width (DSS1)
A11R6
A1lTP1
0.7+0.0
-0.05
Line drive generator (ISS1)
A4R6
A4TP1
0.60.01
Accept reject pulse width (DSS3)
A11R30
A11TP3
0.350.01
e. Reply Evaluator Adjustment.
and REJECT indicators are continually alter
nating indications (intermittent.
(1) Set ME-26B/U SELECTOR switch to
(+) and RANGE switch to 10V. Connect common
(7) Repeat procedures (2) through (6) above.
(8) Adjust AN/UPM-137A SIS generator
l e a d to A13TP2 (ground and dc probe to
A12TP2.
SIF 1 CODER-SUBST PULSE POSN control
until ME-26B/U indication is 50 percent of that
(2) Set AN/UPM-137 SIS generator SIF 1
noted in (4) above. The REJECT indicator should
CODER-Code (A, B, C, D) switches to 7767.
be on. Adjust AN/UPM-137A SIS
(3) Adjust ME-26B/U ZERO ADJ control
for a zero meter indication.
GENERATOR SIF 1 CODER SUBST PULSE
POSN control untlI ME-26B/U indication is 80
(4) Set AN/UPM-317A SIS generator SIF 1
percent of the noted voltage. ACCEPT indicator
CODER-Code (A, B, C, D) switches to 7777. Note
should be on.
ME-26B/U indication.
(5) Set AN/UPM-137A SIS generator SIF 1
4-6. Adjustments
C O D E R - S U B S T PULSE SEL stitch to Cl.
After a circuit in a functional section is required,
Adjust SIF 1 CODER-SUBST PULSE POSN
the functional section should be adjusted to
control until ME-26B/U indication is 65 percent
of that noted in (4) above.
insure proper equipment operation. Two ad-
(6) Adjust control A12R19 until ACCEPT
justment procedures are provided for the trans-
4-6
Change 5
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals