Guy, the Flex is down converted as well to 11kHz before the A/D. Jim, W4ATK On May 21, 2011, at 4:30 PM, Guy Olinger K2AV wrote:
> 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 JIM ROGERS, W4ATK w4...@bellsouth.net http://web.me.com/jimrogers_w4atk K3/100 P3 K2/10 ______________________________________________________________ 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
