HR-1680

[Mark Graalman WB8JKR]

   Fred,

  This problem is caused by the LSB oscillator being too far
from the crystal filter center frequency, either the crystal is
off frequency, or the filter center frequency has changed. My bet
is on the LSB BFO crystal, check it with a freq counter.

Mark  WB8JKR

>Second question:  With this 1680,
> there is a noticable degeneration in audio quality (the base
> disappears) when the function switch moves from LSB to USB, and no
> change at all from USB to CW.  My hunch is that it's miswired.  Any
> ideas?  Thanks in advance.  Also, many thanks for the schematics, to
> all who answered my request.
>
> Fred Wittman

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