I could use some education here please:
What is the advantage of sampling directly off the antenna? I'm
surmising that's what is meant by "real SDR" vs "hybrid SDR". I don't
know if 32-bit ADC's existed when the K3 was being designed, but
Elecraft settled on the hybrid superhet analog 1st IF/digital 2nd IF for
at least one reason and probably many.
The dynamic range of signal amplitudes at my coax connector across the 0
to 30MHz spectrum has got to be huge, even after LORAN-C shut down. Is
there really any benefit to having that broad a spectrum with that large
an amplitude range in the number soup?
If you want to observe that spectrum, wouldn't it be better to use a
spectrum analyzer and save your communications receiver to be optimized
to deal with the tiny little slices we want 99.999% of the time?
If the K3 sampled at the 8MHz 1st IF, after the analog roofing filters
[i.e. RF amp and 1st mixer only], would it make the K3 a "real SDR" in
the eyes of those who don't see it that way now?
I'm serious about the "education" part, this "Is the K3 an SDR" thread
has been going, on and off, for more than a year. It seems that we have
two ideologies going, "Digitalists" vs "Analogists." Unfortunately,
debating ideologies qualitatively is rarely productive.
My education is in math, my understanding of EE is the result of 60
years in ham radio colored by a math background.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org
On 8/19/2013 11:38 AM, Arie Kleingeld PA3A wrote:
We don't have to worry about processorpower. The hardware is already
there and still developping. And Yes, sampling up to 6m is possible.
Apart from that, the interfacing from the machine to us humans can
certainly do better with some innovation (new ideas) as well.
Op 19-8-2013 18:07, Lynn W. Taylor, WB6UUT schreef:
Consider for a moment an SDR with no analog filtering at all.
How wide would the passband be? Are we going to cover everything from
MF to 6m?
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