Return-Path: Received: (qmail 28269 invoked from network); 3 Jan 2001 15:25:47 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by extortion.plus.net with SMTP; 3 Jan 2001 15:25:47 -0000 Received: (qmail 3923 invoked from network); 3 Jan 2001 15:28:22 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 3 Jan 2001 15:28:22 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14DpiB-0002Dv-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 03 Jan 2001 15:20:23 +0000 Received: from mail2.hamilton-standard.com ([153.4.57.12]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14Dpi9-0002DL-00 for rsgb_lf_group@blacksheep.org; Wed, 03 Jan 2001 15:20:22 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from curly.hsd.utc.com by mail2.hamilton-standard.com; (8.9.1/) id KAA23064; Wed, 3 Jan 2001 10:23:14 -0500 (EST) Received: from umrsvr.hsd.utc.com by curly.hsd.utc.com; (8.9.0/) id KAA07955; Wed, 3 Jan 2001 10:19:40 -0500 (EST) Received: from nmex01nt.hsd.utc.com by umrsvr.hsd.utc.com; (8.9.0/) id KAA10102; Wed, 3 Jan 2001 10:17:01 -0500 (EST) Received: by nmex01nt.hsd.utc.com with Internet Mail Service (5.5.2650.21) id ; Wed, 3 Jan 2001 16:11:56 +0100 Message-ID: From: "Soegiono, Gamal" To: rsgb_lf_group@blacksheep.org Subject: LF: decoding FSK signals below 153 kHz Date: Wed, 3 Jan 2001 16:11:55 +0100 X-Mailer: Internet Mail Service (5.5.2650.21) Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-type: text/plain; charset=windows-1252; format=flowed MIME-Version: 1.0 Content-transfer-encoding: 8bit Hello all, there are about 51 frequencies/stations below 153 kHz sending signals modulated with FSK (or derivates thereof). The only stations realy readable are 147k3 (weather brodcast from Pinneberg D), 38k0 and 40k4 (two swedish stations) all using Baudot as coding and FSK as modulation. What the hell do all the other 48 stations do? I can successfully display their data stream in binary format, i.e. make mark frequency cause display of a binary 1 and space frequency cause display of a binary 0 (or vice versa). Thereby I can retrieve their Baudrate. But no known coding scheeme (ARQ, FEC, ASCII etc) causes a readable display. I am not dreaming of de-chiphering the chiphered message contents! All I want is to let the decoder display a stream of ASCII characters in order to eventually see some station call signs or something else which can point me to the origin of those signals. Any idea? best 73 de Gamal