From jfournier@unam.mx Sun Apr 17 19:31:55 1994
Path: ashpoly!cascade!transat!ukc!fennimore!unam!jfournier
From: jfournier@unam.mx (Joachim Fournier)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Apr17.193155.6676@unam.mx>
Date: Sun, 17 Apr 1994 19:31:55 GMT
Organization: Universidad Nacional Autónoma de México (DGSCA)
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).
Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.

When all 14 rows are assembled, the matrix forms an 80-column ASCII status report.

-- 
Joachim Fournier
Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA).
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From jhernandez@purdue.edu Tue Apr 19 19:16:55 1994
Path: ashpoly!cascade!bigsur!purdue!jhernandez
From: jhernandez@purdue.edu (Jens Hernández)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Apr19.191655.4593@purdue.edu>
Date: Tue, 19 Apr 1994 19:16:55 GMT
References: <1994Apr17.193155.6676@unam.mx>
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In article <1994Apr17.193155.6676@unam.mx>, jfournier@unam.mx (Joachim Fournier) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single!

Unsubscribe me from this list! (Wait, this is Usenet, never mind).

-- 
Jens Hernández
Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network.
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From blopez@delphi.com Thu Apr 21 20:38:55 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!blopez
From: blopez@delphi.com (Brian López)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Apr21.203855.7744@delphi.com>
Date: Thu, 21 Apr 1994 20:38:55 GMT
References: <1994Apr17.193155.6676@unam.mx>
Organization: Delphi Internet Services
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X-Newsreader: Netscape 1.1N
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In article <1994Apr17.193155.6676@unam.mx>, jfournier@unam.mx (Joachim Fournier) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.
> The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).

The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code.

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
Brian López -- Delphi Internet Services
"There are 14 nodes and only 10 countries. Count again."

From mdubois@panix.com Sat Apr 23 12:11:55 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!mdubois
From: mdubois@panix.com (Mathieu Dubois)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Apr23.121155.1694@panix.com>
Date: Sat, 23 Apr 1994 12:11:55 GMT
References: <1994Apr17.193155.6676@unam.mx> <1994Apr21.203855.7744@delphi.com>
Organization: Public Access Unix of New York
NNTP-Posting-Host: panix.com
X-Newsreader: Netscape 1.1N
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In article <1994Apr21.203855.7744@delphi.com>, blopez@delphi.com (Brian López) writes:
> The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code.

Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame.

-- 
=== Mathieu Dubois ===
Dept of Electrical Engineering, Public Access Unix of New York
"We don't sign stars. We build them."