[Elecraft] K2 filter pix

[Tom Hammond]

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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