From gmoreau@demon.co.uk Tue Jul 09 13:38:34 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!demon!gmoreau From: gmoreau@demon.co.uk (Graham Moreau) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul09.133834.5364@demon.co.uk> Date: Tue, 09 Jul 1996 13:38:34 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Graham Moreau Zyxel U-1496E @ 14,400 bps "Extraordinary claims require extraordinary spectra." From mlarsson@earthlink.net Tue Jul 09 17:16:34 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!mlarsson From: mlarsson@earthlink.net (Marisol Larsson) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul09.171634.9339@earthlink.net> Date: Tue, 09 Jul 1996 17:16:34 GMT References: <1996Jul09.133834.5364@demon.co.uk> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1996Jul09.133834.5364@demon.co.uk>, gmoreau@demon.co.uk (Graham Moreau) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Marisol Larsson SupraFAXModem 28.8 @ 14,400 bps "The carrier frequency does not drift by accident." From rnovak@uni-hamburg.de Thu Jul 11 11:01:34 1996 Path: ashpoly!cascade!bigsur!uni-hamburg!rnovak From: rnovak@uni-hamburg.de (Rodrigo Novak) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul11.110134.1906@uni-hamburg.de> Date: Thu, 11 Jul 1996 11:01:34 GMT References: <1996Jul09.133834.5364@demon.co.uk> <1996Jul09.171634.9339@earthlink.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Jul09.171634.9339@earthlink.net>, mlarsson@earthlink.net (Marisol Larsson) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. > Unsubscribe me from this list! (Wait, this is Usenet, never mind). The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- === Rodrigo Novak === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "The carrier frequency does not drift by accident." From chernandez@panix.com Sat Jul 13 09:50:34 1996 Path: ashpoly!cascade!mxgate!coyoacan!panix!chernandez From: chernandez@panix.com (Camila Hernández) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul13.095034.9233@panix.com> Date: Sat, 13 Jul 1996 09:50:34 GMT References: <1996Jul09.133834.5364@demon.co.uk> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Jul09.133834.5364@demon.co.uk>, gmoreau@demon.co.uk (Graham Moreau) 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! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Camila Hernández -- Public Access Unix of New York "There are 14 nodes and only 10 countries. Count again." From amoreau@panix.com Mon Jul 15 12:36:34 1996 Path: ashpoly!cascade!bigsur!panix!amoreau From: amoreau@panix.com (Astrid Moreau) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul15.123634.1450@panix.com> Date: Mon, 15 Jul 1996 12:36:34 GMT References: <1996Jul09.133834.5364@demon.co.uk> <1996Jul09.171634.9339@earthlink.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Jul09.171634.9339@earthlink.net>, mlarsson@earthlink.net (Marisol Larsson) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. > Unsubscribe me from this list! (Wait, this is Usenet, never mind). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Astrid Moreau "Measuring a record you own is listening, not piracy." 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