Mike:
GREAT CATCH!!!
I have NO CLUE why I didn't latch on to that when he and I originally
corresponded.
He still seems to have some unusual peaks/dips, but they may be related to
the fact that he seems to be driving the input to Spectrogram (and his
sound card) a bit hard. He and I are still (I think) corresponding on this.
73,
Tom N0SS
At 06:49 AM 10/24/04, Mike S wrote:
This statement is the key: "sidetone was at 420 hz."
AFAIK, all of the filter alignment documentation assumes you've got the
sidetone set to the default 600 Hz. If you want a 420 Hz sidetone, you
need to set the marker in Spectrogram to 420 Hz, and align the filters so
they're centered on that! Note that all your filters appear shifted about
(600-420=) 180 Hz. The K2 firmware ends up adjusting VFO/BFO frequencies
for CW mode based on the sidetone setting.
The accuracy of your transmission frequency will be dependent upon how
closely you tune the received CW to 420 Hz audio (or more correctly, to
the frequency at which the sidetone is set).
At 07:04 AM 10/24/2004, john wrote...
>Here's a link the the filter performance pictures. Note that bandwidth seems
>narrower than setting (maybe) and there's some odd dips in the response.
>
>http://www.old-radios.com/K2filter.html
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