Superhet versus direct-to-baseband: In-band IMD is one issue. Perhaps an even more important one is the non-linear group delay caused by the crystal filters. Unlike other SDRs, the KX3 does have a roofing filter at baseband but I expect it should have flatter group delay than a crystal filter.
For CW it wouldn't make any difference but I would expect SSB and AM to sound better on the KX3. (Spoken in ignorance since I don't have one.) Alan On Thu, 2012-02-23 at 13:57 -0700, Niel Skousen wrote: > I would actually expect them to be very similar since the DSP backend > (while not identical) should be very similar. The SDR elements of > the two are probably very close to the same. > > Wayne has shown a talent over the years of applying software object > encapsulation and reuse concepts in hardware design. DSP and SDR > just sort beg for that to be applied in the K3 - KX3 design evolution. > I'd also expect some lessens learned and improvements from the KX3 to > migrate back into the K3 within the next 4-6 months too... > > Niel > > On Feb 23, 2012, at 1:15 PM, Igor Sokolov wrote: > > > > > Bill, > > I did not mean to put any blame on you. In fact I am very grateful to you > > for sharing with us your first hand impressions of this so much awaited > > radio. I am just genuinely interested if KX3 audio is the same or better > > then that of K3. I hope, when KX3 is in production, Elecraft or some of the > > users will measure in band IMD and come up with the figures. And I hope > > those figures will exceed similar specs of K3. > > > > 73, Igor UA9CDC > > > > ----- Original Message ----- > > From: Bill K9YEQ > > To: [email protected] > > Cc: 'Elecraft' > > Sent: Friday, February 24, 2012 2:00 AM > > Subject: RE: [Elecraft] [KX3] KX3 update FT > > > > > > Igor, > > > > My hearing isn't perfect. Just ask my wife. I am using PC speakers, not > > headphones. My environment has fan noise... but to me they sound very > > similar, next to identical. I did not observe on a scope. YMMV. > > > > 73, > > Bill > > K9YEQ > > KX3 Field Test #12 > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Igor Sokolov > > Sent: Thursday, February 23, 2012 1:49 PM > > To: [email protected] > > Cc: 'Elecraft' > > Subject: Re: [Elecraft] [KX3] KX3 update FT > > > > ----- Original Message ----- > > From: Bill K9YEQ > > >I do not generally use Software to run my Elecraft radios other than > > >the macros. I work on >PCs/software for a living, so I love the > > >options available with all the Elecraft radios. Like Greg, I >have > > >mine sitting just above the pullout keyboard/Mouse tray in front of the > > >K3. I have a easy to >reach antenna switch. I have listened to audio > > >coming from both units without any signal >conditioning, filters, NB, > > >NR, etc. Hard to tell the two apart on the PC stereo speakers. That is > > >very sweet. > > > > That is not quite what I was expecting. KX3 being SDR based should sound > > better then K3 because KX3 should lack in band IMD caused by non linearity > > of crystal filter. When I compare audio of my K3 with that of QS1R the > > difference is pretty noticeable. Well, sooner or later someone will measure > > in band IMD of KX3 and hopefully we will get objective data. > > > > 73, Igor UA9CDC > > > > __________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > > > > > > > __._,_.___ > > Reply to sender | Reply to group | Reply via web post | Start a New Topic > > Messages in this topic (5) > > RECENT ACTIVITY: New Members 31 New Photos 17 > > Visit Your Group > > Switch to: Text-Only, Daily Digest • Unsubscribe • Terms of Use > > . > > > > __,_._,___ > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
