From jsmirnov@demon.co.uk Fri Mar 22 16:18:28 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!demon!jsmirnov
From: jsmirnov@demon.co.uk (Ji-woo Smirnov)
Newsgroups: comp.dsp
Subject: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Mar22.161828.4614@demon.co.uk>
Date: Fri, 22 Mar 1996 16:18:28 GMT
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design.

-- 
Ji-woo Smirnov | jsmirnov@demon.co.uk
PGP Key fingerprint: 64F4 24EB FFC5 B4DE
"Keep the channels open."

From dmacdonald@cam.ac.uk Sun Mar 24 04:54:28 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!dmacdonald
From: dmacdonald@cam.ac.uk (Dong-hyun MacDonald)
Newsgroups: comp.dsp
Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Mar24.045428.3609@cam.ac.uk>
Date: Sun, 24 Mar 1996 04:54:28 GMT
References: <1996Mar22.161828.4614@demon.co.uk>
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In article <1996Mar22.161828.4614@demon.co.uk>, jsmirnov@demon.co.uk (Ji-woo Smirnov) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
Dong-hyun MacDonald -- University of Cambridge Computer Laboratory
"There are 14 nodes and only 10 countries. Count again."

From slindqvist@clari.net Sun Mar 24 09:01:28 1996
Path: ashpoly!cascade!brgate!saturno!clari!slindqvist
From: slindqvist@clari.net (Sergei Lindqvist)
Newsgroups: comp.dsp
Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Mar24.090128.1039@clari.net>
Date: Sun, 24 Mar 1996 09:01:28 GMT
References: <1996Mar22.161828.4614@demon.co.uk>
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In article <1996Mar22.161828.4614@demon.co.uk>, jsmirnov@demon.co.uk (Ji-woo Smirnov) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

-- 
Sergei Lindqvist
Tape trading list upon request. SASE required for international mail.