Re: Understanding the KX3 Block Diagram - SDR!

[Mike Morrow-3]

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
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[Guy, K2AV]

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On Wed, Mar 7, 2012 at 11:44 PM, Mike Morrow <[hidden email]> wrote:

> 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
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
>

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[Edward R Cole]

One should also remember that the K3 is ALSO a SDR.  The 15-KHz
second IF is a SDR, so the KX3 is a beneficiary of the design lessons
learned in making the K3.  I suspect technology for a "good" zero IF
SDR was not as available when the K3 design was done (and I'm sure
some other design considerations).

Rick Campbell was a pioneer in the direct receiver field, however his
R2 was an analog receiver, although a step toward a true SDR.

One thing I am looking forward to doing is a A/B side by side
comparison of the KX3 and my SDR-IQ.  The other comparison is with my
K3, of course.  I wonder is March 12 will see the beginning of
shipments? Hope Hope


73, Ed - KL7UW, WD2XSH/45
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