TM 55-1930-209-14&P-12
4.
Adjust L106, L201, L203, L204, L251, and L252 to obtain the maximum audio (noise) level.
NOTE:
The Horizon Canada and later versions of the Horizon USA do not have
coils L201, L202 and L203, but a crystal filter instead. No tuning of the
crystal filter is necessary.
5.
Adjust L251 to obtain a zero reading on the zero center meter.
6.
Connect the voltmeter, set for DC volts, to T12.
7.
Preset the slugs of L101 and L103 to the top, and the slugs of L102, L104, and L105 to the bottom (see
Figure 5).
8.
Adjust L107 for maximum voltmeter reading.
9.
Readjust L107 to obtain the same voltmeter readings on channels 01W and 06. If this cannot be obtained,
readjust LP81 slightly.
10.
Select channel 06 again.
11.
Connect the voltmeter, set for DC volts, to T12.
12.
Set the output level of the communications monitor at 3 to 5 times higher than that of no signal meter
reading.
13.
Adjust L101, L102, L103, L104, L105, L106, L201, L202, L203, L204, and L205 for maximum voltmeter
reading. Reduce the output level of the signal generator as tuning progresses.
NOTE:
The Horizon Canada and later versions of the Horizon USA do not have
coils L201, L202 and L203, but a crystal filter instead. No tuning of the
crystal filter is necessary.
14.
Repeat Steps 9 through 12 several times.
15.
Adjust L105 to obtain the same voltmeter reading at T12 on channels 01W and 06.
16.
Readjust L105 to obtain the same 12 dB QS on channels 01W and 06.
TROUBLESHOOTING
By following the sequence of steps shown on the Troubleshooting Charts (Figures 10, 11, and 12), a defective stage or
component may be isolated.
NOTE:
The troubleshooting charts are for use after the transceiver has been aligned to the desired frequency.
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