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Figure 4-18. CMAX/C MIN Adjustment Locator
Up
TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
Next
Figure 4-20. Connection and Adjustment Points - Amplitude Detector Adjustment


TM 11-5820-873-34
adjust a 0 VDC null at both 1 6 MHz
NOTE
and 29.9 MHz. If not, 2A4R5 should
Ensure  VTVM  is  isolated  from
be adjusted for a negative at 1.6 MHz
ground at the power cord.
(3)
Connect VTVM DC between 2A4C20
equal to the positive at 29.9 MHz.
(5) and 2A4C21 (3).  Set mode switch to AM.  Set
Neither signal should exceed the 0.1
frequency to 1.6 MHz. Key microphone.
VDC tolerance from 0 VDC.
(4)
Adjust 2A4C1 (4) for a VTVM null
(5)
Set frequency to 29.9 MHz.  Adjust
indication of 0 VDC + 0.005 VDC.
2A4R5 (3) for a VTVM null indication of 0 VDC + 0.1
(5)
Unkey microphone. Set mode switch
VDC.
to OFF.
(6)
Set  frequency  to  1.6  MHz  and
Remove meter and cable.
recheck VTVM null indication. If not within tolerance,
(6)
Swing Phase and Amplitude Control
readjust 2A4R5 as indicated in NOTE above.
CCA into place and secure fasteners. Reconnect RF
(7)
Unkey microphone. Set mode switch
line to terminal post (1). Reinstall antenna coupler in
to OFF.
case.
Remove meter and cable.
d.
Phase Detector Adjustment. (Fig 4-21)
(8)
Swing Phase and Amplitude Control
CCA into place and secure fasteners. Reconnect RF
(1)
Remove case from Antenna Coupler
line to terminal post (1). Reinstall antenna coupler in
CU2229/URC-92.
Connect RF and control cables
case.
between the antenna coupler and Receiver/Transmitter
4-20. Antenna Coupler Lubrication
RT-1277/URC-92.  Ensure the receiver/transmitter is
correctly powered and grounded.
Approximately every twelve months (6 months in salty
(2)
Loosen fasteners and swing Phase
atmospheres) the antenna coupler should be lubricated
and Amplitude Control CCA away from chassis.
as follows.  Remove the case from Antenna Coupler
Disconnect and isolate RF line from terminal post (1).
CU-2229/URC-92.  Apply a small amount of type G
Connect clip leads of a BNC/clip lead cable to terminal
molybdenum grease to the roller bar. Also apply the
post (1) and ground post (2). Connect a 50 ohm dummy
molybdenum grease on the end bearings or roller
load to BNC/clip lead cable.
inductor 2L4. Operate 2L4 thru its full range several
NOTE
times to evenly distribute the grease.  Lubricate the
Cable clip leads should not exceed
threaded  shaft  or  variable  capacitor  2C1  with
1/2 inch in length.  Overall cable
molybdenum grease or a light weight petroleum base
length should not exceed 6 inches.
grease. Reinstall case on antenna coupler.
4-21. Conversion
Requirements
for
13/26
VDC
Ensure  VTVM  is  isolated  from
Operation
ground at the power cord.
(3)
Connect VTVM DC between 2A4C17
Refer to Operator and Organizational Maintenance
(4) and 2A4C19 (5).  Set mode switch to AM.  Set
Manual, TM 11-5820-873-12.
frequency to 1.6 MHz. Key microphone.
4-22. Conversion Requirements for 115, 230/132,
(4)
Adjust 2A4R5 (3) for a VTVM null
264 VAC Operation
indication of O VDC 0.1 VDC.
NOTE
Refer to Operator and Organizational Maintenance
When adjusting the phase detector
Manual, TM 11-5820-873-12.
output, it may not be possible to
Section V. ADMINISTRATIVE STORAGE
c.
Place all loose components in a plastic bag
4-23. Prepare the AN/URC-92 for administrative storage
and secure the bag to one of the handles on the
in accordance with the following
RT1277/URC-92.
d.
The
RT-1277/URC-92
and
the
a.
Perform  the  Preventive  Maintenance
CU2229/URC-92 are completely sealed and do not
Checks and Services outlined in Chapter 4.
require any special storage precautions. The units may
b.
Perform  the  Preventive  Maintenance
be stored in temperatures ranging from 55 to 85 at
C
Checks and Services outlined in this chapter.
humidities up to 100% without damage.
4-46


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