> 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 <
[hidden email]> 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
>>
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