I can't speak about the 718 or the Elecraft DSP, but in my experience such "brick wall" filtering creates far more problems than solutions. A huge amount of unwanted stuff is produced by signals on the sharp edges of such a filter that appear throughout the passband - much of it is that 'noise' you mention.
I work 99% CW and my K2 is seldom set for less than 1.0 kHz bandwidth. My minimum is 0.4 kHz used only when I get a "loudmouth" shouting from almost on top of the signal I'm copying. That occasionally happens during a contest, but that's about it. I do have a skill that a great many experienced CW ops have that might be the difference. We can copy easily with several signals within the passband. It's like listening to one voice in a crowded party; we just "tune out" the other babble going on around us unless it's something we want to follow. It only gets difficult if one nut starts shouting in my ear when I'm trying to listen to someone else, Hi! Ron AC7AC -----Original Message----- Hello I haven't had my K2 (# 5846 ) long enought to fully understand all the different settings that are possible with it , so I have a question. My CW filter setting are FL-1 1.50, FL-2 0.70, FL-3 0.40, and FL-4 is 0.10. Even FL-4 is no where near as effective as the 250 hz crystal filter in my Icom 718. When I turn on the 250 hz filter in the Icom, it's like building a wall right on each side of the signal that I am listening to. Nothing else is heard except noise and signals that are exactly on the same frequency. Is this kind of selectivity possible with the K2? If I installed the DSP option would that help? And if so, what would the filter settngs need to be? The only options I presently have are the 160 meter option, noise blanker, serial adapter, ssb option, and the KPA100. Thanks Scott N5SM _______________________________________________ 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 _______________________________________________ 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
