> It wouldn't seem to provide much advantage. The bandwidth of the four-pole crystal IF filter may be adjusted in three steps from about 200 to 850 kHz. The selectivity as designed is outstanding. > > Mike / KK5F > K1 #175 since 11/2000
==================================== I usually use an outboard audio filter when operating at home. I agree that it is not needed for selectivity but it makes the sidetone sound like my K2 and I enjoy a clean CW note. I think one problem with a simple low pass filter is that the K1 has a wide range of possible sidetone pitch and a cutoff frequency that would help someone who uses a low pitch as I do would not pass a high one. Thus, filters would need to be adjustable or custom designed for the desired pitch. Rick Dettinger K7MW _______________________________________________ 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
