Hello John I have both the KDSP2 and the KAF2 filters. I only use the DSP filter anymore.
The DSP filter makes a good supplement to the basic crystal filter. Set up the crystal filter first, using Spectrogram. Then turn on the DSP filter at comparable bandwidths and adjust the crystal filter/DSP filter combo for the best overall cw passband. Works very well indeed. The noise reduction ability depends somewhat on the bandwidth of the crystal filter before the DSP. With too narrow a filter the noise is less readily reduced, but it can be reduced to some degree. At wider bandwidths, the DSP NR is more effective. The NR would be readily apparent in ssb service, as there the BW is a couple of kHz or more. The "digital" sound from the DSP depends on how aggressive you have set the DSP. DSP NR complements the regular noise blanker, and is less effective on the kinds of noise sources where the blanker shines. Together, they do a decent job of reducing noise overall. Good luck and 73 Bob N6WG -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of John Lyon Sent: Thursday, June 01, 2006 10:11 AM To: elecraft@mailman.qth.net Subject: [Elecraft] K2 DSP vs. Audio Filter I am considering these two filters for a K2 that I'm about to buy. I'm mainly a cw guy. I've had experience with audio filters, but not DSP. Actually now that I think about it, my TS-570DG has an audio DSP filter of sorts. I strongly dislike the audio coming out of it as harsh and grainy. I've listened to the demos for ssb and cw on the Elecraft site for the DSP filter. The noise reduction is dramatic, but the audio sounds, well, digital. If the K2 is as quiet a receiver as I've read, does the DSP trash up the received audio? And how does it do with power line noise? I would be interested in anyone's comments and impressions of these two filters in real world operating situations, even though they are apples and oranges. Is DSP worth three times the money in your opinion, and why? John W9LHG K1 #2174 _______________________________________________ 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
