[Elecraft] DSP

[JAMES ROGERS]

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 <ron at 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 at 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 at 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
w4atk at bellsouth.net
http://web.me.com/jimrogers_w4atk
K3/100 P3
K2/10