[Elecraft] K2 filter bandwidth versus real bandwidth...

[David Woolley]

Steve Kallal wrote:
> 
> If I want to pass a 500 Hz signal, what bandwidth should I select in the
> filter calibration? I guess the selected bandwidth isn't measured at 6 db
> down, or is it?

As this is done by open loop control of a varicap control voltage, I'd 
expect the relationship to vary considerably between units.  If you need 
  finely tuned settings, you should probably set the filter using a 
spectrum display, with white noise input, e.g. using the spectrogram 
method.  You can probably use your digital mode terminal program instead 
of spectrogram.

I think it is probably safer to treat the displayed bandwidth as an 
(approximately) monotonic function of true bandwidth, rather than 
measuring the actual bandwidth.

-- 
David Woolley
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