[Elecraft] SSB cal fil problem

[Jerry Hancock]

I applied both the SSB filter mods.  I am using OP1 for filter 1 and 2.  I
have both BFO settings at 209.  I would assume that this would make both FL1
and FL2 the same.  When I zero beat WWV and watch the tones (as per an
earlier post) I see the 500hz and 600hz tones at the correct place in the
spectrum using sound forge spectrum analysis.  When I switch to FL2 with the
BFO settings at 209, the tones shift up about 39hz in the FFT.

If I go back to CAL FIL and adjust FL2 to say 207, the spectrum display
changes and I can get FL2 to match FL1 (as to the position of the tones).
If I then exit FL2 and loop back to FL1, FL1 is correct.  Pressing XFIL once
to select FL2 and the BFO setting is at 207 but the tone is back where it
was, 39hz off.  Setting the BFO for FL2 to 205 corrects it until I loop back
around again.

If I change FL1 to 211 I can make the tone move and leaving FL2 at 209, If I
loop through the filters, it is ok.

This happens on LSB on 14mhz.  The difference seems less on 40m.  I can
leave the USB filters at the same BFO settings without an audio shift.

So what gives?

Thanks, I enjoy this radio to no end.


--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
Please post in Plain-Text only.---