Re: [amsat-bb] 1200/2400 hertz Mozhaetz telemetry

[Cliff Buttschardt <cbuttsch@xxxxxxxxxx>]

Greg, Howard and the net.  At least you remember how this antiquated 
system used to work.  I do remember it was the most forgiving, most
fail proof slow speed data system ever!  Possibly the Russians are 
using it for these reasons.  If we could prove this so via MixW2 or
possibly by some hardware from that era, it would be most helpful.
Nothing wrong with old, proven but good systems! Cliff K7RR

"Greg D." wrote:
> 
> Yikes, this sure stired up a cloud of brain dust!
> 
> For those who don't know, the Kansas City Standard was used
> in the Barnstorming early days of personal computing, before
> what we now call a PC was invented.  It was used to record
> programs and data on audio cassettes; hard disks were typically
> the size of washing machines, and the floppy disk (8 inch!) was
> too still expensive for most.
> 
> As I recall, the format used 8 cycles of 2400 hz for a "1", and
> 4 cycles of 1200 hz for a "0".  A simple modem did the decoding.
> The resulting 1200 baud data stream was sent in to a standard
> async serial port.  You would literally "play" your program from
> the tape into your computer to load it.  It worked quite well.
> They even published software on thin plastic sheets that you
> put on your phonograph at 45 rpm.  Called them "Floppy ROMs"...
> 
> We now return you to the 21st century...
> 
> Greg  KO6TH
> 
> >From: Cliff Buttschardt <cbuttsch@slonet.org>
> >Reply-To: cbuttsch@slonet.org
> >To: amsat-bb@amsat.org
> >Subject: [amsat-bb] 1200/2400 hertz Mozhaetz telemetry
> >Date: Mon, 02 Dec 2002 01:49:43 +0000
> >
> >A number of members have indicated that the telemetry on the Russian
> >Mozhaetz satellite sounded like two tone FSK, 1200 and 2400 hertz.
> >      This might be the very old "Kansas City standard" used by computer
> >people when only tape recorder data storage was available economically.
> >This standard was most forgiving and easy to implement. We will have to
> >look back many years for information on this one!!   Cliff K7RR
> >----
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> 
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