Hi, Mike. I noticed exactly the same thing here. In fact the passband ripple of my KX1 is pretty bad, 600Hz is actually in a trough not a peak! And when I narrow the filter to the narrowest setting it centers on around 480Hz.
Neither of these is a fairly significant issue in practice though. If I have occasion to use the filter in its narrowest position then I zero beat first then use the RIT to move the signal down to 500Hz before closing the filter to its narrowest position. Most of the time my filter stays in one of three positions: 5 oclock - fully open - Quiet band. 12 oclock - halfway open - Fair amount of QRM. 9 oclock - about 2/10 open - In the 9 oclock position the audio peaks (to the ear) at 600Hz so this is the most useful position for zero- beating. I almost never close it right down (7 oclock position) however I did last weekend when I had a station come on 100Hz away from my QSO and he couldn't hear me. In this situation I use the RIT control to send the wanted signal to 500Hz after zero-beating at 600Hz. Does that help? By the way Michael VE3WMB mentioned before that he has the same ripple pattern in the ten-tec scout and it may be a feature of the Jones filter design. After all the component count in the KX1 is tightly controlled and there are tradeoffs because of that. http://www.ac6rm.net/mailarchive/html/elecraft-list/2004-06/msg00906.html 73 Martin. ___________________________________________________________ Win a BlackBerry device from O2 with Yahoo!. Enter now. http://www.yahoo.co.uk/blackberry _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
