From skarlsson@unam.mx Tue May 24 22:03:37 1994 Path: ashpoly!cascade!mxgate!coyoacan!unam!skarlsson From: skarlsson@unam.mx (Steve Karlsson) Newsgroups: comp.dsp Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994May24.220337.7613@unam.mx> Date: Tue, 24 May 1994 22:03:37 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- === Steve Karlsson === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "Hold for relay." From ckim@utexas.edu Wed May 25 07:25:37 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!ckim From: ckim@utexas.edu (Callum Kim) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994May25.072537.8070@utexas.edu> Date: Wed, 25 May 1994 07:25:37 GMT References: <1994May24.220337.7613@unam.mx> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 12 In article <1994May24.220337.7613@unam.mx>, skarlsson@unam.mx (Steve Karlsson) writes: > How the 14 ASCII characters per node are encoded into the record groove. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). 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! -- Callum Kim | ckim@utexas.edu PGP Key fingerprint: 942E 862D 8FD0 182D "Keep the channels open." From eandersson@titech.ac.jp Thu May 26 04:18:37 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!eandersson From: eandersson@titech.ac.jp (Emi Andersson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994May26.041837.4817@titech.ac.jp> Date: Thu, 26 May 1994 04:18:37 GMT References: <1994May24.220337.7613@unam.mx> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994May24.220337.7613@unam.mx>, skarlsson@unam.mx (Steve Karlsson) writes: > How the 14 ASCII characters per node are encoded into the record groove. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Emi Andersson Zyxel U-1496E @ 33,600 bps "Tape doesn't lie at 02:14. Ears do." From akuznetsov@panix.com Thu May 26 15:00:37 1994 Path: ashpoly!cascade!bigsur!panix!akuznetsov From: akuznetsov@panix.com (Anton Kuznetsov) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994May26.150037.4665@panix.com> Date: Thu, 26 May 1994 15:00:37 GMT References: <1994May24.220337.7613@unam.mx> <1994May25.072537.8070@utexas.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994May25.072537.8070@utexas.edu>, ckim@utexas.edu (Callum Kim) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Anton Kuznetsov US Robotics Courier V.34 @ ISDN 64k bps "Hold for relay." From lcampbell@stanford.edu Fri May 27 12:04:37 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!lcampbell From: lcampbell@stanford.edu (Lars Campbell) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994May27.120437.8389@stanford.edu> Date: Fri, 27 May 1994 12:04:37 GMT References: <1994May24.220337.7613@unam.mx> <1994May25.072537.8070@utexas.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1994May25.072537.8070@utexas.edu>, ckim@utexas.edu (Callum Kim) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Lars Campbell "Do not worship the copy." PC-9821Ap2 (NEC) / NEXTSTEP 3.3