From blee@clari.net Wed Jun 07 08:46:39 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!blee From: blee@clari.net (Brian Lee) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun07.084639.3490@clari.net> Date: Wed, 07 Jun 1995 08:46:39 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- === Brian Lee === Dept of Electrical Engineering, ClariNet Communications Corp "Row 14. No joke." From djohansson@earthlink.net Thu Jun 08 00:11:39 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!djohansson From: djohansson@earthlink.net (Diego Johansson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun08.001139.5685@earthlink.net> Date: Thu, 08 Jun 1995 00:11:39 GMT References: <1995Jun07.084639.3490@clari.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jun07.084639.3490@clari.net>, blee@clari.net (Brian Lee) 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. -- Diego Johansson | djohansson@earthlink.net PGP Key fingerprint: 93A4 CEFB 8685 E72A "Keep the channels open." From chughes@kiae.su Fri Jun 09 11:19:39 1995 Path: ashpoly!cascade!mxgate!coyoacan!kiae!chughes From: chughes@kiae.su (Callum Hughes) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun09.111939.9261@kiae.su> Date: Fri, 09 Jun 1995 11:19:39 GMT References: <1995Jun07.084639.3490@clari.net> <1995Jun08.001139.5685@earthlink.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jun08.001139.5685@earthlink.net>, djohansson@earthlink.net (Diego Johansson) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Callum Hughes "They will send a copy in my place." Commodore Amiga 500 (1MB OCS) / Linux 1.2.13