[Elecraft] Realign xtal filter for changed sidetone frequency?

[Vic Rosenthal]

Sverre Holm wrote:
> A simple question, do I have to realign the CW filter's BFO settings if
> I change the sidetone? 
> 
> I have 600 Hz today, and have heard some advantages of going lower. This
> could be a simple thing to experiment with if the K2 processor
> recomputes all the BFO frequencies accordingly.
> And a very complex operation with Spectrogram etc if it does not.

If you change the pitch of the sidetone, the location of the signal in 
the passband will change, so if you want to maintain the same relative 
location (which you certainly will want to do with narrow bandwidths), 
then you must readjust the filters.

I've gotten very good at doing this with Spectrogram; I can do the whole 
thing in a couple of minutes!

-- 
73,
Vic, K2VCO
Fresno CA