From mbrennan@panix.com Thu Aug 17 19:27:53 1995 Path: ashpoly!cascade!brgate!saturno!panix!mbrennan From: mbrennan@panix.com (Mateo Brennan) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug17.192753.1323@panix.com> Date: Thu, 17 Aug 1995 19:27:53 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 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. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Mateo Brennan Tape trading list upon request. SASE required for international mail. From msilva@uu.net Thu Aug 17 22:07:53 1995 Path: ashpoly!cascade!bigsur!uu!msilva From: msilva@uu.net (Min-jun Silva) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug17.220753.6638@uu.net> Date: Thu, 17 Aug 1995 22:07:53 GMT References: <1995Aug17.192753.1323@panix.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Aug17.192753.1323@panix.com>, mbrennan@panix.com (Mateo Brennan) writes: > 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. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! Top-posters will be placed in my ~/.killfile without notice. -- Min-jun Silva Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------ From dduarte@tum.de Fri Aug 18 00:55:53 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!dduarte From: dduarte@tum.de (Dave Duarte) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug18.005553.1068@tum.de> Date: Fri, 18 Aug 1995 00:55:53 GMT References: <1995Aug17.192753.1323@panix.com> <1995Aug17.220753.6638@uu.net> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Aug17.220753.6638@uu.net>, msilva@uu.net (Min-jun Silva) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! > Top-posters will be placed in my ~/.killfile without notice. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Dave Duarte Practical Peripherals 14.4 @ 28,800 bps "5 sigma is a discovery. 7 is a question."