From akim@ox.ac.uk Thu Jan 26 13:23:38 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!akim From: akim@ox.ac.uk (Amy Kim) Newsgroups: comp.dsp Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan26.132338.6637@ox.ac.uk> Date: Thu, 26 Jan 1995 13:23:38 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. 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. -- Amy Kim | akim@ox.ac.uk PGP Key fingerprint: 22CB E154 66C6 694A "Keep the channels open." From blopez@netcom.com Fri Jan 27 22:46:38 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!blopez From: blopez@netcom.com (Bastien López) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan27.224638.4042@netcom.com> Date: Fri, 27 Jan 1995 22:46:38 GMT References: <1995Jan26.132338.6637@ox.ac.uk> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan26.132338.6637@ox.ac.uk>, akim@ox.ac.uk (Amy Kim) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- === Bastien López === Dept of Electrical Engineering, NETCOM On-Line Communication Services "There are 14 nodes and only 10 countries. Count again." From clopez@cam.ac.uk Sun Jan 29 06:41:38 1995 Path: ashpoly!cascade!mxgate!coyoacan!cam!clopez From: clopez@cam.ac.uk (Callum López) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan29.064138.2341@cam.ac.uk> Date: Sun, 29 Jan 1995 06:41:38 GMT References: <1995Jan26.132338.6637@ox.ac.uk> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Jan26.132338.6637@ox.ac.uk>, akim@ox.ac.uk (Amy Kim) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > 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! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Callum López "When every node is whole, the channel opens." PC-9821Ap2 (NEC) / NEXTSTEP 3.3 From ejohansson@kiae.su Sun Jan 29 20:03:38 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!ejohansson From: ejohansson@kiae.su (Elaine Johansson) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan29.200338.6672@kiae.su> Date: Sun, 29 Jan 1995 20:03:38 GMT References: <1995Jan26.132338.6637@ox.ac.uk> <1995Jan27.224638.4042@netcom.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Jan27.224638.4042@netcom.com>, blopez@netcom.com (Bastien López) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Elaine Johansson -- Kurchatov Institute of Atomic Energy, Moscow "Hold for relay."