That's where the better shape factor hits home. For the 1 kHz filter, with -30dB BW of 1400 Hz, we have adequate rejection at 1400/2 = 700 Hz, versus the 5-pole 500 Hz at 1092/2 = 546 Hz, a difference of only 154 from the center frequency. Not a bad single filter choice for for CW ops like me who aren't serious contesters, and are interested in using the context filter.
Bob NW8L On Dec 11, 2007 9:44 AM, Bill Tippett <[EMAIL PROTECTED]> wrote: > > the 500 Hz will adequately reject a > signal at 1092/2 = 546 Hz versus the 400 at 647/2 = 323 Hz > or a difference of ~220 Hz from the center frequency, > which might NOT be handled by using SHIFT. Of course > most strong signals at 323 Hz spacing will have clicks > and phase noise swamping out any advantage...unless > it's another K3 or Orion! :-) > > 73, Bill W4ZV _______________________________________________ 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
