On 5/19/19 7:39 AM, David Woolley wrote:
Unfortunately, the amateur radio world behaves like popular culture
and hijacks engineering terms and redefines them. Nearly every radio
receiver nowadays is largely an SDR, but the amateur community tends
to use the term in a more restricted sense.
What I think is meant by Full SDR is what, more correctly, would be
described as direct sampling.
Yes.
However, the really key point is that Elecraft's main skills are with
analogue electronics. To the extent that the K4 has no analogue front
end, it really doesn't benefit from the company's core expertise
(although low phase noise clocks may also be one of their skills).
Personally, I suspect that there is significant analogue processing
before the A/D convertor (the front end) and that is what will give it
any edge it has over the competition.
A/D convertors are essentially commodity items, to the only real input
the Elecraft desginers will have is setting the price point.
I disagree with that. It takes a lot of analog expertise to properly
implement a direct-sampling receiver. There are many ways to get it wrong.
Alan N1AL
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