From msouza@panix.com Thu Apr 28 22:20:23 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!msouza From: msouza@panix.com (Morag Souza) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Apr28.222023.7979@panix.com> Date: Thu, 28 Apr 1994 22:20:23 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. 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. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Morag Souza US Robotics Courier V.34 @ 14,400 bps "Tape doesn't lie at 02:14. Ears do." From arodriguez@clari.net Sat Apr 30 22:36:23 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!arodriguez From: arodriguez@clari.net (Astrid Rodríguez) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Apr30.223623.2881@clari.net> Date: Sat, 30 Apr 1994 22:36:23 GMT References: <1994Apr28.222023.7979@panix.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Apr28.222023.7979@panix.com>, msouza@panix.com (Morag Souza) writes: > How the 14 ASCII characters per node are encoded into the record groove. > Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Astrid Rodríguez Tape trading list upon request. SASE required for international mail.