Wayne was talking about an optional "roofing filter that is in the audio range ahead of the DAC" in the YouTube video. So it is seriously down-converted before it goes digital. It's not a Flex 5000. 73, Guy.
On Sat, May 21, 2011 at 4:05 PM, Ron D'Eau Claire <r...@cobi.biz> wrote: > And I'd not be at all surprised to see such upgrades available at some > future time if the improvement is significant in the K3 application and > there is sufficient demand. But that may not be the case. > > The K3's receiver is a superhet (i.e. converts the input signal to a fixed > intermediate frequency where it is amplified, filtered then demodulated). A > successful superhet receiver is a carefully balanced system from the antenna > input to the audio or data output. One component that might make a huge > improvement in one superhet design may have little or no benefit in another > superhet design. In the 90 years since Col. Armstrong developed the superhet > receiver platform all of the improvements have been in the various > components, not in the underlying design. And that continues. > > However, a full SDR receiver may not use the superhet architecture at all. > An SDR receiver typically converts the RF signal at the antenna input > directly into digital data and from that point on it's all crunching bits > and bytes until, if an analog output such as audio to speaker or phones is > needed, the digital data is used to produce an analog audio signal. I got > the impression from the video with Wayne that the KX3 *may* use a full SDR > receiver. > > Whether or not the KX3 uses a full SDR or retains a superhet architecture, > it will have quite different demands on the components than the K3, > including the DSP system. > > I'm sure there will be a LOT of test data comparing the KX3 and K3 receiver > as well as endless anecdotal comparisons shared here on the reflector by > those with both units. I'm looking forward to them. > > Ron AC7AC > > > -----Original Message----- > I note that Wayne makes a point of the fact that the DSP in the KX3 is > 32-bit, floating point. This buzzphrase is also used by other manufacturers > to tout their DSPs, but I can't find any similar description of the DSP > hardware in the K3. To raise again a point that was mentioned yesterday: if > there's a potential for getting more DSP horsepower in the K3, I'm sure that > many K3 owners would happily pay for a retrofit. > > Tony KT0NY > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
