I'm not disagreeing with Julian at all but wanted to toss out some related ideas. The noise you hear does become colored as you crank down a properly designed DSP filter--and centered on the filter freq. On the other hand some poorly designed filters are excited by energy near the center freq and do ring. I have a rice box reviewed in a recent QST, and the review pointed out the filter is so bad at 100Hz and below it becomes unusable. A little noise crackle and ringing like a bell begins and does not drop much for a few seconds--tough on high speed cw. Another phenomenon to consider is aliasing. This has popped up in a few versions of Orion software causing ghost signals to appear in the subreceiver. I was recently amused to find an audio discussion of this in which someone commented about a ghost band playing. Here's a link http://www.dsprelated.com/showmessage/24519/1.php . I would really be surprised if the K3 had any of these problems. So far I haven't bought one but I am creeping up to it.
Julian, I really like your VOAProp package. 73 Bob W2WG -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Julian, G4ILO Sent: Saturday, August 30, 2008 9:17 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 - DSP ringing on CW & SSB Perhaps I don't understand the meaning of the term 'ringing' but it seems to me that on any radio when you use a narrow filter you hear a sort of ringing noise that has a pitch of the frequency the filter is centered on. It's an inevitable result of the fact that you are not hearing an even distribution of noise across the whole audio spectrum, but a narrow segment of noise whose amplitude distribution follows the shape of the filter. In other words, I think it's normal. ----- Julian, G4ILO. K2 #392 K3 #222. http://www.g4ilo.com/ G4ILO's Shack http://www.ham-directory.com/ Ham Directory http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 -- View this message in context: http://n2.nabble.com/K3---DSP-ringing-on-CW---SSB-tp793827p794022.html Sent from the Elecraft mailing list archive at Nabble.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 E-mail message checked by Spyware Doctor (5.5.1.322) Database version: 5.10590e http://www.pctools.com/en/spyware-doctor/ _______________________________________________ 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
