RE: K2-CW-Filter-Response: is that ok?
Posted by
Ron D'Eau Claire-2 on
Apr 26, 2005; 6:50pm
URL: http://elecraft.85.s1.nabble.com/K2-CW-Filter-Response-is-that-ok-tp377646p377648.html
Look at it this way. You're using a 700 Hz pitch with a 1.5 kHz wide filter.
If you center the 700 Hz in the filter bandpass, the bandpass will extend
750 Hz above and 750 Hz below the 700 Hz beat frequency. That puts your
carrier zero beat 50 Hz inside the bandpass so you can hear a beat note on
the "wrong" side of the carrier. The skirts of the filter response will let
you hear beat notes well beyond the 750 Hz edge of the bandpass.
Vic's suggestion to move the bandpass "up" away from the carrier frequency
is exactly the thing to do. Make sure the lower-frequency cutoff point is
above the carrier frequency to ensure you still get "single-signal" (or
"single sideband") reception.
Ron AC7AC
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