Posted by
Vic K2VCO on
Mar 11, 2005; 3:44pm
URL: http://elecraft.85.s1.nabble.com/filter-alignment-question-tp375642p375644.html
W3FPR - Don Wilhelm wrote:
> If the tone pitch change is 20 Hz or less it is because of the quantizing
> error in the K2 and nothing can be done about it. The K2 firmware works to
> preserve the pitch no matter where the filters are set as long as the signal
> is anywhere within the filter passband.
Well, something CAN be done about it, if you don't mind changing the filter
bandwidth slightly. For example, suppose that you have set a filter to 400 Hz
bandwidth and located the BFO so that the signal is centered in the filter, and
suppose that the result is that the pitch of the centered signal comes out 10
Hz. high. Just change the bandwidth to 420 (or 380) Hz., readjust the BFO and
let the K2's magic algorithm do its work. Chances are it will come out on
pitch. I have been able to adjust all of my filters so that there is no change
in pitch when I cycle through them.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco_______________________________________________
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