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Page Title:
Table 3-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC-92 |
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|  TM 11-5820-873-34
Table 3-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC-92-Continued
STEP
ACTION
INDICATION
NEXT STEP
to ground post. Set frequency to 1 602 MHz.
Depress TUNE START.
3b
Set mode selector to CW.
COUPLER STATUS FAULT indicator Is Illumi-
Yes: step 4a
nated, transmitter unkeys and drive motors stop
No: step33
driving.
4a
Set mode switch to CPI,R TUNE KW. Depress
NOTE
TUNESTART.
If the time delay runs out during this test, de-
press TUNE START once more If tuning occurs
the second tune the indication is good
Antenna Coupler completes tune cycle,
Yes: step 4b
COUPLER STATUS FAUI,T indicator goes out
No: step 34
and COUPLER STATUS READY indicator
illuminates.
4b
Set mode switch to CW then return to CPLR
COUPLER STATUS READY indicator goes out
Yes: step 4c
TUNE KW.
And COUPLER STATUS FAULT indicator
No: step 35
illuminates.
4c
Set mode switch to AM Key transmitter.
COUPLER STATUS FAULT indicator goes out
Yes: step 4d
and COUPLER STATUS READY indicator
No: step 37
illuminates.
4d
Set frequency to 1 802 MHz Key transmitter.
COUPLER STATUS FAULT indicator
Yes: step 4e
illuminates.
No: step 37
4e
Set frequency to l 602 MHz Key transmitter
COUPLER STATUS READY indicator
Yes: step 5a
illuminates.
No: step 37
5a
Perform the following procedure for each setting
NOTE
Yes: step 6a
listed Set and tune to the tune frequency Reset
The Antenna Coupler Control gain adjustment
No: step39
frequency to the check frequency. Set mode
can affect both the REFL power indication and
switch to CW and key transmitter Check both
tuning Normal gain setting is about 14.5 VDC
the FWD and REFL power.
0.5 VDC but a sight adjustment may be neces-
NOTE
sary If some frequencies do not tune, adjust the
The frequencies below do not necessarily match
gain slightly clockwise If the REFL power indi-
the average powers listed in the Indication
cation is a little high, adjust the gain slightly
column for this step.
counterclockwise The final gain control setting
Tune
Check
must satisfy both requirements If not, proceed to
Frequency
Frequency
the troubleshooting reference for this step
1.604
1.602
Antenna coupler completes each tune cycle Also
2.004
2.002
the power readings should be approximate to one
4.001
4.000
of the acceptable FWDIREFL ratios below
8.001
8.000
Average
REFL
12.001
12.000
FWD (watts)
(or less)
16.001
16.001
20
0.8
20.001
20.000
30
1.2
24.001
24.000
40
16
29.999
29.998
50
2.0
60
2.4
70
2.8
80
3.2
100
4.0
6a
Set mode switch to OFF Disconnect cabling be-
tween receiver-transmitter and coupler unit.
6b
Reassemble Antenna Coupler Unit
6c
Antenna Coupler Unit CU-22291URC-92 check-
out is now complete. Coupler unit is now service-
able.
7
Set mode switch to OFF Remove Control Logic
COUPLER STATUS FAULT indicator
Yes: step 37
CCA 2A1. Set mode switch to AM. Jumper
illuminates.
No: step39
2XA1-12 to ground.
8
COUPLER STATUS FAULT indicator went out.
Yes: step 9
No: step 10
9
COUPLER STATUS TUNING indicator Illumi-
Yes: step37
nated and transmitter is keyed
No: step 11
10
Set mode switch to OFF Remove Control Logic
COUPLER STATUS FAULT indicator is not lit
Yes: step37
CCA 2A1 Set mode switch to CPLR TUNE KW.
No: step 39
11
COUPLER STATUS TUNING indicator
Yes: step 12
illuminated
No: step 13
3-13
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