From tokafor@ee.ashford-poly.edu Tue Jan 10 01:15:22 1995
Path: ashpoly!cascade!bigsur!ee!tokafor
From: tokafor@ee.ashford-poly.edu (Tom Okafor)
Newsgroups: alt.conspiracy
Subject: [AUDIO + DECODE] 1988 Coyoacan Pirate FM Cassette (Node 04)
Message-ID: <1995Jan10.011522.1988@ee.ashford-poly.edu>
Date: Tue, 10 Jan 1995 01:15:22 GMT
Organization: Ashford Polytechnic Institute, Dept. of Electrical Engineering
NNTP-Posting-Host: ee.ashford-poly.edu
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In response to the community report noting that the July 6, 1988 Coyoacan
pirate FM cassette ('se cayo el sistema') and the reproducible decoding
method for 'ORION BUILT A PATCH NOT A STAR' had never been published in
alt.conspiracy:

1. PLAYABLE DIGITIZED CASSETTE RECORDING:
   Elena Vazquez at Red Coyoacan BBS transferred the 1988 Maxell XLII-S
   cassette recorded at 20:14 CST on 6 July 1988 (104.3 MHz Coyoacan
   pirate relay). It is now hosted directly at:
     /forensics/coyoacan_1988_node04_cassette.mp3
   (You can also load it into the live FFT spectrogram at
    /forensics/signal_lab.html or play it inside /forensics/ via passkey
    COYOACAN-88 or ORION-PATCH.)

2. REPRODUCIBLE SPECTRAL & MORSE/DBPSK DECODING METHOD:
   * Channel L vs Channel R differential sub-carrier: 14.2001 Hz sine
     locked in 180-degree anti-phase (L - R isolates the 14.2001 Hz clock).
   * Following the Spanish voiceover cutoff and the 1000 Hz / 750 Hz
     synchronization beep, a 750.0 Hz continuous-wave (CW) keystream
     transmits at 25 WPM (dot = 48 ms, dash = 144 ms):
       --- .-. .. --- -. / -... ..- .. .-.. - / .- /
       .--. .- - -.-. .... / -. --- - / .- / ... - .- .-.
   * ASCII / Hex Demodulation Table (stardust.c --node 4):
       HEX : 4F 52 49 4F 4E 20 42 55 49 4C 54 20 41 20 50
             41 54 43 48 20 4E 4F 54 20 41 20 53 54 41 52
       TEXT: "ORION BUILT A PATCH NOT A STAR"
       CRC8: 0x54 (VERIFIED)

   What does 'A PATCH' mean? See Entry #27 (s02239.txt): 'The Patch' was
   Marcus Hale's internal name for UNIT-8 (Luna Gray), built by
   H.A.R.R.I.S.O.N. to patch over Nova Hart's frequencies after the fire.

-- 
Tom Okafor // Dept. of EE, Ashford Polytechnic Institute
Author of stardust.c (see comp.dsp thread t02-demod-source.txt)