[amsat-bb] Re: Spitnik

John Melton John.Melton at Sun.COM
Thu Sep 6 12:34:54 PDT 2007

I can remember listening to this with my old Pye Communications Receiver 

There is an interesting document at 
http://www.vibrationdata.com/Newsletters/March2006_NL.pdf starting on 
page 9 is a description of Sputnik 1 along with some pictures (including 
one of Roy Welch).

Page 11 has the following paragraph:

"The signal was a Pulse Duration Modulation (PDM) signal, according to 
Reference 2 and 3. Sputnik's internal pressure was encoded as pulse 
length, and temperature as length between pulses."

Also references the amsat web site for the audio:



John g0orx/n6lyt

   John Melton
   Sun IT CTO Office
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Dave Guimont wrote:
> Hi Lee,
> I "heard" Sputnik, and all I can tell you is that I heard a series of 
> "beeps"....I was a navy pilot stationed at St. Louis NAS at the time, 
> and just had a receiver with a simple wire antenna.
> I can tell you nothing more than that, and have no idea what, if any, 
> information the "beep" carried, and do not know today what was conveyed..
> If you find out let me know!!
>             73, Dave wb6llo at amsat.org
>                     Disagree: I learn....
>                Pulling for P3E...  
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