Ladder filters vary both their input/output impedance and their midfrequency when you vary the bandwith. High level rigs like the K2 therefore adjust the BFO regarding bandwith (Cal Filter), simpler rigs like the KX1 want the OP to do this by brain :-)
The impedance change is why you have more or less attenuation, while varying the bandwith. 72/3 de Peter, DL2FI www.qrpproject.de > -----Ursprüngliche Nachricht----- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von David Toepfer > Gesendet: Mittwoch, 26. April 2006 19:11 > An: Roger Marrotte; [email protected] > Betreff: Re: [Elecraft] KX1 Crystal Filter Center Frequency a > Little Low > > On the low end of the filter it drops down from around 600Hz > over most of the range to around 500Hz. I am sure others can > detail why. > > David, K3ZTUE > . _______________________________________________ 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
