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.
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.
--
David Woolley
Owner K2 06123
On 19/05/2019 04:09, Buck wrote:
The radio is full SDR as opposed to the analog front end of the K3.
However an option, the K4HD, is a superhet receive function. Like
previous Elecraft radios, this can be added later if you think you need
it. Preliminary is that it will not be necessary unless you operate in
the presence of strong stations (multi-multi).
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