Gary NL7Y wrote: > > I've found that with the 200Hz filter enabled in both of my receivers via > diversity reception mode, BW set to 150 or less, that weak sigs pop out of > my high S5 city noise floor like the best audio APF enabled rigs I've owned > (many). Elecraft has a Genie of sorts helping us on CW, and no filter > ringing that I care to mention.
Are you sure that the 200Hz filter had anything to do with this? Maybe you would have had the same results with a 400 or 500 Hz filter with the DSP bandwidth at 150 or less. I've seen several comments like this, but keep this in mind: with the DSP bandwidth set to 150 Hz the only time you will notice a difference between the 200 and 400 Hz filters is when there is a S9+30db signal that is more than 100 and less than 200 Hz away from the desired signal. I made some simplifying assumptions in the above, but you get the idea. Put another way, you would not notice any difference in performance between a K3 with *only* the supplied 2.7 kHz filter and one with a 200 Hz filter unless there is a signal loud enough to activate the hardware AGC (about S9+30dB) which is within the filter bandwidth but outside the DSP bandwidth. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ 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
