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Decoder CCA
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TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
Next
Figure 4-9. 19.45 MHz Adjustment Setup #1 (1A4A3)


TM 11-5820-873-34
L8. Repeat as necessary to obtain maximum output as
4-18.
Receiver-Transmitter RT-1277/URC-92
indicated by the RF voltmeter.
Adjustments.
(d) Remove resistive pad connected between
The following adjustments are not intended as a means of
L10 and ground. Remove jumpers from 1A4A1U8-2 and
circuit card assembly checkout or troubleshooting. If an
1A4A1L7. VTVM (AC) remains connected to 1A4A1-4.
adjustment cannot- be performed, troubleshoot the
Again adjust L10, L9 and L8, as in step (c) above, until
related  circuit  card  assembly  using  conventional
maximum output is attained. Minimum acceptable output,
troubleshooting methods for repair Refer to the List of
when adjusted, is 85 mV RMS.
Illustrations for required schematic figure numbers
(4) 17 MHz Adjustment (1A4A1).
a. Spectrum Generator 1A4A1 Adjustment.
(a) Connect VTVM (AC) (unterminated) to
(1)  Remove  receiver-transmitter  top  cover
1A4A1-6. Connect signal generator as shown in Figure 4-
Remove Synthesizer protective cover Place Spectrum
8. Jumper junction of 1A4A1C56, C61 and R50 to CCA
Generator CCA 1A4A1 on card extender Connect a 50
ground.
ohm dummy load to receiver-transmitter ANT jack.
(2) 20 MHz Adjustment(1A4A1).
(a) Connect oscilloscope probe to 1A4A1-1.
Connect frequency counter to oscilloscope vertical
amplitude output.
NOTE
The following adjustment involves three
interacting  components  Due  to  this
interaction,  the  adjustment  of  each
component  should  be  repeated  until
maximum output is obtained.
(b) Adjust 1A4A1L2, 1A4A1L3 and 1A4A1L4
for maximum output Minimum acceptable output is 300
mV peak-to-peak at a frequency of 20 MHz 20 Hz.
(3) 21 Mhz Adjustment.
(a) Connect VTVM (AC) (unterminated) to
Figure 4-8. 17MHz Adjustment Setup (1A4A1)
1A4A1-4. Connect signal generator as shown in Figure 4-
NOTE
7.
The  following  adjustment  involves  two
(b) Jumper 1A4A1U8-2 to CCA ground.
interacting  components.
Due  to  this
Jumper across 1A4A1L7 Set signal generator for 250 mV
interaction,  the  adjustment  of  each
RMS.
component  should  be  repeated  until
NOTE
maximum output is obtained.
The following adjustment involves three
(b) Adjust 1A4A1L16 and 1A4A1L17 for
interacting  components.
Due  to  this
maximum output.
interaction,  the  adjustment  of  each
(c) Remove jumper from C56, C61, R50
component  should  be  repeated  until
junction.
Remove resistive pad connected between
maximum output is obtained.
1A4A1Q6 and ground VTVM remains connected to
1A4A1-6.
(d) Adjust 1A4A1L14 for maximum output
Again adjust L16 and L17 for maximum output. Minimum
acceptable output, when adjusted, is 90 mV RMS.
(5) Remove card extender and reinstall Spectrum
Generator CCA 1A4A1 Reinstall Synthesizer protective
cover Reinstall receiver-transmitter top cover. Remove
dummy load.
b. Low Digit Generator 1A4A2 Adjustment.
(1)  Remove  receiver-transmitter  top  cover.
Remove Synthesizer protective cover. Place Low Digit
Generator CCA 1A4A2 on card extender. Connect a 50
ohm dummy load to receiver-transmitter ANT jack.
(2) VCO Adjustment (1A4A2)
Figure 4-7. 21 MHz Adjustment Setup (1A4A1)
(c) Adjust 1A4A1L10, 1A4A1L9 and 1A4A1L8
for maximum output First adjust L10, then L9, and then
4-39


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