From dmartinez@ox.ac.uk Thu Nov 16 17:06:13 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!dmartinez From: dmartinez@ox.ac.uk (Dmitri Martínez) Newsgroups: comp.dsp Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov16.170613.6681@ox.ac.uk> Date: Thu, 16 Nov 1995 17:06:13 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 How the 14 ASCII characters per node are encoded into the record groove. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Dmitri Martínez Tape trading list upon request. SASE required for international mail. From bsokolov@earthlink.net Thu Nov 16 18:52:13 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!bsokolov From: bsokolov@earthlink.net (Bastien Sokolov) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov16.185213.2933@earthlink.net> Date: Thu, 16 Nov 1995 18:52:13 GMT References: <1995Nov16.170613.6681@ox.ac.uk> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov16.170613.6681@ox.ac.uk>, dmartinez@ox.ac.uk (Dmitri Martínez) writes: > How the 14 ASCII characters per node are encoded into the record groove. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Bastien Sokolov "Extraordinary claims require extraordinary spectra." Amiga 1200 (Blizzard 030/50) / NEXTSTEP 3.3 From fkowalski@ox.ac.uk Fri Nov 17 21:22:13 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!ox!fkowalski From: fkowalski@ox.ac.uk (Fiona Kowalski) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov17.212213.2291@ox.ac.uk> Date: Fri, 17 Nov 1995 21:22:13 GMT References: <1995Nov16.170613.6681@ox.ac.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Nov16.170613.6681@ox.ac.uk>, dmartinez@ox.ac.uk (Dmitri Martínez) writes: > How the 14 ASCII characters per node are encoded into the record groove. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Fiona Kowalski -- Oxford University Computing Laboratory "Do not worship the copy." From sduarte@demon.co.uk Mon Nov 20 01:05:13 1995 Path: ashpoly!cascade!brgate!saturno!demon!sduarte From: sduarte@demon.co.uk (Sun-mi Duarte) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov20.010513.1184@demon.co.uk> Date: Mon, 20 Nov 1995 01:05:13 GMT References: <1995Nov16.170613.6681@ox.ac.uk> <1995Nov17.212213.2291@ox.ac.uk> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Nov17.212213.2291@ox.ac.uk>, fkowalski@ox.ac.uk (Fiona Kowalski) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Sun-mi Duarte SupraFAXModem 28.8 @ ISDN 64k bps "Extraordinary claims require extraordinary spectra."