Return-Path: Received: (qmail 7581 invoked from network); 3 Jan 2001 16:20:32 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 3 Jan 2001 16:20:32 -0000 Received: (qmail 16572 invoked from network); 3 Jan 2001 16:15:13 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 3 Jan 2001 16:15:13 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14DqS7-0002U5-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 03 Jan 2001 16:07:51 +0000 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14DqS5-0002U0-00 for rsgb_lf_group@blacksheep.org; Wed, 03 Jan 2001 16:07:49 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id QAA19336; Wed, 3 Jan 2001 16:08:37 GMT Received: (qmail 17992 invoked from network); 3 Jan 2001 17:02:05 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 3 Jan 2001 17:02:05 -0000 Received: by gauntlet.mail.dera.gov.uk; id QAA17479; Wed, 3 Jan 2001 16:55:07 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma017207; Wed, 3 Jan 01 16:53:44 GMT Received: from frn-gold-1.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Wed, 3 Jan 2001 16:08:43 +0000 Received: by frn-gold-1.dera.gov.uk with Internet Mail Service (5.0.1460.8) id ; Wed, 3 Jan 2001 16:06:11 -0000 Message-ID: <65AECDF1F89AD411900400508BFC869F0D74D9@pdw-mail-1.dera.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: LF: Re:decoding below 153 kHz Date: Wed, 3 Jan 2001 16:06:23 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.0.1460.8) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Consider the (alleged) negative altitude and rather wet destination of many transmissions at low frequencies and the effort+encryption put into sending these. They don't need to use ancient stop start signalling in most cases as there are plenty of better ways of achieving bit sync. A few are also possibly commercial private navigation systems. You could try direction finding and co-ordinate with someone a long way off to get some sort of triangulation. DF is quite reliable with loops at these frequencies provided you stay away from nearby conductive structures. If you could decipher the message content you would probably have to be shot ! Andy G4JNT > -----Original Message----- > From: Soegiono, Gamal [mailto:soegiono@nm.hsd.utc.com] > Sent: 2001-01-03 15:12 > To: 'rsgb_lf_group@blacksheep.org' > Subject: LF: decoding FSK signals below 153 kHz > > > 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 P> > 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 > > > > -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.