I just spend a day working on a replacement 81597 board for my Omni VI
rigs... added the ten turn pots.
Odd thing is when I tried to align the board, obtaining the 400 Hz offset
for CW was impossible. After pulling my hair for a few hours, I traced the
runs and discovered there were no trimmer caps for CW offset on the 9 MHz
LSB crystal! The board is marked 81597 92842 REV A. No way it could have
ever worked in an Omni VI, even though it supposedly came from a scrapped
unit. It seems to follow the BFO scheme used in the earlier V models.
Board can be modified by swapping the LSB and USB lines, and reversing the
two crystals. Weirdness never ceases.
Pete
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