Re: [amsat-bb] Soundcard Decoder for UO-11?

[John Magliacane <magliaco@xxxxxxxxxxxxxx>]

On Tue, 16 Nov 1999, Laura Halliday wrote:

> Just for fun I hit the library yesterday and looked up one of the
> classic articles on the subject, "Data Decoder for UoSAT" in
> Wireless World, May 1983, and found it to be an excellent
> discussion of the matter. You could still build the machine if you
> wanted to - it's all 4000-series CMOS and a couple of op amps -
> but would be on your own for interfacing its output (clock and
> data) to a modern computer.

This is an EXCELLENT article!  I built a slightly updated version of this
demodulator UO-9 and UO-11 decoding, and found that it performed better in
the presence of noise than a homebrew PLL (XR2211-based) demodulator I
had been using.  The description of this article helped me greatly to
understand correlation decoding, and to eventually design PSK and FSK
modems that I now use for AO-16 and KO-25 communications.


73, de John, KD2BD

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