Posted by
Tom Hammond-3 on
URL: http://elecraft.85.s1.nabble.com/K2-filter-pix-tp371062p371064.html
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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