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Page Title:
Table 3-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC- 92-Continued |
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|  TM 11-5820-873-34
Table 3-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC- 92-Continued
STEP
ACTION
INDICATION
NEXT STEP
6b
Set FREQ CONTROL switch to B Repeat step 6a
Frequency counter and front panel readouts
Yes: step 6c
using FREQUENCY B controls
agree for each frequency
No: step 132
6c
Set FREQ CONTROL switch to A Pull out VFO
VFO lamp illuminates
Yes: step 6d
PULL control (VFO on)
No: step 108
6d
Connect frequency counter to oscilloscope ver-
Frequency counter indicates 2.0000 MHz 5
Yes: step 7a
tlcal amplifier output. Connect oscilloscope
KHz minimum
No: step 109
across dummy load Set FREQUENCY A controls
to 2.0000 MHz Key microphone Rotate VFO
PULL Control through its entire range
7a
Set FREQ CONTROL to A XMT B RCV. Key
Frequency counter indicates 1 6000 MHz and
Yes: step7b
microphone Rotate FREQUENCY B, 10 KHz
front panel readouts agree
No: step 132
control.
7b
Release microphone key. Observe front panel
No readout change occurs
Yes: step 8a
readout and rotate FREQUENCY A, 10 KHz con-
No: step 132
trol
8a
Disconnect antenna coupler control cable Discon-
VTVM indicates - 10 dB or more
Yes: step 8b
nect CW key and mlc. Remove dummy load from
No: step 110
ANT jack IA8JI Connect signal generator to
ANT jack 1A8J1 Connect VTVM (AC) to
PHONE jack 1A1J3 Set mode switch to LSB Set
FREQ CONTROL to B Set FREQUENCY B con-
trols to 29 9994 MHz Adjust VOLUME CON-
TROL for VTVM indication of - 20 dB Set signal
generator output level to 0.5 uV Adjust signal
generator frequency to approximately 29 9994
MHz, until VTVM indication peaks
8b
Repeat step 82 substituting the following FRE-
VTVM indicates at least - 10 dB or more
Yes: step 9a
QUENCY B, and signal generator frequency set-
No: step 132
tings:
16 0100 MHz
10 0100 MHz
7 5100 MHz
5 0100 MHz
3 5100 MHz
2.0100 MHz
1 6100 MHz
9a
Set mode switch to USB Return FREQUENCY B
VTVM indicates at least - 10 dB or more
Yes step 9b
switches to 29 9994 MHz. Adjust signal genera-
No: step 136
tor frequency to approximately 29 9994 MHz, un-
til VTVM indication peaks.
9b
Set mode switch to AM, FREQUENCY B controls
VTVM indicates less than - 20 dB
Yes: step 9c
to 29 9994 MHz Signal generator output level to
No: step 122
3 0 uV, frequency to 29 9994 MHz, 300k, 1 KHz
modulation Adjust signal generator for peak
VTVM indication Adjust VOLUME control for
-10 dB VTVM indication. Remove modulation
from signal generator output.
9c
Set mode switch to LSB. Set FREQUENCY B
At each position noise blanks momentarily then
Yes: step 10
switches to 20 000 MHz Disconnect VTVM from
returns.
No: step 132
PHONE jack Increase VOLUME control until
noise is heard Rotate 1 MHz control thru each of
its positions.
10
Set mode switch to OFF Disconnect control cable
Meter indicates a range between + 12 and + 22
Yes: step 11
at receiver-transmitter 1A8J4 Connect multim-
VDC + 10%
No: step 143
eter between ACCESSORY connector 1A8J4-P
and ground Set mode switch to AM Slowly ad-
just ANTENNA COUPLER CONTROL gam con-
trol 1A2R2 thru its entire range.
11
Reset gain control 1A2R2 to 14.5 VDC 0.5
Step 12
VDC Set mode switch to OFF Disconnect dum-
my load from antenna jack 1A&J1 Connect RF
and control cables between the receiver-transmit-
ter and a known good CU-22291URC-92 An-
tenna Coupler Connect a 50 ohm dummy load to
3-3
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