[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: Soundcard Decoder for UO-11?

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

-=-=-=-=-=-=-=-=-=-=-=-=- John A. Magliacane, KD2BD -=-=-=-=-=-=-=-=-=-=-=-=-
Internet  : kd2bd@amsat.org          |  Voice : +1.732.224.2948
Satellite : AO-16, KO-25             |  Morse : -.-  -..  ..---  -...  -..
Packet    : KD2BD @ N2SMV.NJ.USA.NA  |  WWW   : http://www.njin.net/~magliaco/
Video     : 426.250 MHz/439.250 MHz  |  FAX   : +1.732.224.2060
-=-=-=-=-=-=-=-=-=-=-=- Linux Doesn't Cost.  It Pays. -=-=-=-=-=-=-=-=-=-=-=-

Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org