[Elecraft] Understanding the KX3 Block Diagram - SDR!

[Mike Morrow]

Mike wrote:

> First, have you used a direct conversion receiver?...
> Now add that back end you mention. There is so much "magic" that can be
> done there. Of course, its not really magic. Its digital signal processing.
> ...
> Bottom line, its a very sound way to implement a rig these days.

This is a little off-topic for the Elecraft list, but with respect to SDR
technology mentioned above, it's very interesting (to me, anyway) that a
Chinese 2m/70cm FCC part 90 HT (Baofeng UV-3R) has been available for a year
that is implemented using SDR technology through a RDA1846 chip.  The very
interesting data sheet showing the I/Q and DSP components of the chip is
at http://versatechmicro.com/file/RDA1846_datasheet_v1.2e.pdf .

How much are these pioneering SDR HTs?  They're all over the hamfest circuit
for $50 to $60, or from China direct for much less.  Ignoring the various
issues with this low cost and not-quite ham gear, I am amazed at finding full
SDR technology now appearing within **very very inexpensive** radio gear.

Doubtless, SDR is the future of radio electronics.

73,
Mike / KK5F