[Elecraft] K2 CW and DSP

[John Graf]

Excellent!!  Thanks for taking the time to write and for the in-depth  
explanation.  I am constantly amazed (and grateful) for the expertise  
available here on the reflector.

I will be working to correct the problem this weekend.  I have used  
Spectrogram (though obviously not well) and have a copy.  I like your  
idea of using the OPT1 filter and will give that a try.

Thanks again and 73,

John, WA6L

On Jun 5, 2007, at 8:54 PM, Don Wilhelm wrote:

> John,
>
> That is not a consequence of any construction error, but a  
> consequence of your filter alignment.
>
> When you align a wide filter for either CW or SSB, do NOT CENTER  
> it. Use Spectrogram and align it so that the low frequency edge of  
> the passband cuts off above zero frequency (I prefer 200 Hz at the  
> lowest corner).  In other words, an 1800 Hz wide CW filter should  
> have an audio response from 200 to 2000 Hz.
>

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