Adjustments
HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual 7-11
VCO2 adjust
108-04962 and 08-05322
The test point and measurement results for 108-05322 are given in brackets.
Adjusting VCO2 in Test mode
q Select Test 1.
q Connect an oscilloscope to TP5 (TP9) and set up for 5 V per division and
timebase to 2 ms per division.
q Short TP6 and TP7 together.
q Starting from the bottom of the coil, adjust L40 tuning core for a minimum
repetition rate. Remove the short from TP6 and TP7.
I
Great care must be taken to use the correct trimming tool to prevent damage
to the tuning core.
q Connect a DC voltmeter to TP5 (TP9). Starting from the bottom of inductor
L39, adjust the tuning core for a reading between 7.8-8.2 V. The frequency
at TP8 should measure 44.5445 MHz ±100 Hz (44.5455 MHz ±100 Hz).
q Select Test 2.
q Check the voltage at TP5 (TP9) reads 11-15 V. The frequency at TP8 should
measure 44.5485 MHz ±100 Hz (44.5495 MHz ±100 Hz).
q Select Test 3.
q Check the voltage at TP5 (TP9) reads 2-4 V. The frequency at TP8 should
measure 44.5405 MHz ±100 Hz (44.5415 MHz ±100 Hz).
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