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 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
