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
sound better on the KX3. (Spoken in ignorance since I don't have one.)
> 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:
[hidden email]
> > 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:
[hidden email]
> > [mailto:
[hidden email]] On Behalf Of Igor Sokolov
> > Sent: Thursday, February 23, 2012 1:49 PM
> > To:
[hidden email]
> > 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
> >
> > __________________________________________________________
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