K7TV wrote:
>
> Researching my options for a K3 panadapter (Softrock, LP-PAN, SDR-IQ,
> Perseus, Mercury...) I want to thank Paul W9AC for sharing his experience
> with the SDR-IQ on the list:
>
> ...
>
> I would be very interested to read similar detail about the other possible
> hardware and software choices. An overview table showing which spectrum
> analysis software packages work with which hardware choices would be very
> helpful.
>
I agree. I also wonder why a device that is basically only needed to display
a wiggly line showing band activity needs to cost as much as a budget
transceiver. An SDR is basically not a lot different from a direct
conversion receiver which QRPers habitually knock up in an hour or two using
parts from their junk box. The computer sound card and software does most of
the work. And for K3 panadapter use you don't even need a tunable
oscillator.
I would be interested in ideas in which ingenuity rather than wads of cash
are used to meet the requirement. The idea for a simple SDR by EA3GHS
described here
http://ea3ghs.googlepages.com/VERY-SIMPLE-SOFTWARE-DEFINED-DSB-RAD.doc looks
like a possible answer, though I'm not knowledgeable enough to adapt it to
this purpose. The author suggests it is a bit lacking in sensitivity and
that the oscillator signal could be radiated, both of which would presumably
solved by adding an amplifier stage to the input.
-----
Julian, G4ILO. K2 #392 K3 #222.
http://www.g4ilo.com/ G4ILO's Shack http://www.ham-directory.com/ Ham
Directory http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3
--
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