I find that the narrower filters take out a lot of the noise before it hits the DSP and it can even make just rag chew conditions nicer in my very electrically noisy area. Actually I'm quite excited that once I get my K3 back that I can set the 250Hz filter to be able to use it up at 350. I even am adding the 1Khz filter as the step in the noise when switching from my 250Hz to my 1.8Khz was pretty large.
Honestly I'm not so sure that the 1.8 is really all that much of a help over the 2.7 but the 250 is a big help over the 2.7 and the 1.8. Plus I just like having the radio do all the intelligent rock switching. Makes it a very nice combination and mixing of the old way of doing things and the new way of doing things. On Sun, 2008-07-06 at 13:56 +0100, David Cutter wrote: > I think I must be missing something. > > As I understand it, the additional crystal filters are only really necessary > when operating with very strong adjacent signals in the passband. So, if > you don't have a need for rejection of such strong signals, let's say >40 > over S9 (somebody correct this figure please) then you don't need these > extra filters, the DSP will cope with these large signals. The filters are > only there to prevent overload of the DSP. > > Therefore, to perform the very best diversity reception in <40 over S9 > conditions, turn off those extra filters in configuration menu. > > Having turned off the filters, I can engage the attenuator to avoid DSP > overload if needed. Yes, I know it also reduces the signal I'm trying to > hear, but that sacrifice may be what is needed. > > For diversity reception using low gain loop, pennant, flag, Beverage, loaded > whip antennas, the signal input is very much lower than from the tx antenna, > so, crystal filters are probably not be needed at all. > > Or do I have it all completely wrong? > > David > G3UNA > > _______________________________________________ > 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 _______________________________________________ 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
