Return-Path: Received: from mtain-ma04.r1000.mx.aol.com (mtain-ma04.r1000.mx.aol.com [172.29.96.12]) by air-da04.mail.aol.com (v127_r1.1) with ESMTP id MAILINDA041-85e64b82e426cb; Mon, 22 Feb 2010 15:08:06 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 78955380001E7; Mon, 22 Feb 2010 15:08:04 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NjeYe-0004Gk-40 for rs_out_1@blacksheep.org; Mon, 22 Feb 2010 20:07:08 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NjeYd-0004Gb-OL for rsgb_lf_group@blacksheep.org; Mon, 22 Feb 2010 20:07:07 +0000 Received: from smtp.qtxt.dns-iol.com ([195.200.78.13]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NjeYa-00052r-8z for rsgb_lf_group@blacksheep.org; Mon, 22 Feb 2010 20:07:07 +0000 Received: (qmail 5858 invoked by uid 507); 22 Feb 2010 21:06:41 +0100 Received: from unknown (HELO JR) (john.rabson@numeo.fr@217.67.155.178) by smtp.qtxt.dns-iol.com with SMTP; 22 Feb 2010 21:06:41 +0100 Message-ID: <201002222106550093.028E1B99@smtp2.numeo.fr> In-Reply-To: <9afca2641002221154p40cccc31x1e19f2b0095ac73e@mail.gmail.com> References: <32098189.1842344.1266827344324.JavaMail.fmail@mwmweb080> <20100222112301.D8324F3862@smtps02.kuleuven.be> <201002221851390968.021247E4@smtp2.numeo.fr> <9afca2641002221154p40cccc31x1e19f2b0095ac73e@mail.gmail.com> X-Mailer: Courier 3.50.00.09.1098 (http://www.rosecitysoftware.com) (P) Date: Mon, 22 Feb 2010 21:06:55 +0100 From: "John RABSON" To: rsgb_lf_group@blacksheep.org Mime-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: AW: LF: AW: Beaconing on 8.79 kHz in QRSS Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d600c4b82e42429d3 X-AOL-IP: 193.82.116.20 The 2.5km was on 87 SSB. On 27 we used NBFM (much shorter range). John F5VLF *********** REPLY SEPARATOR *********** On 22/02/2010 at 19:54 Roger Lapthorn wrote: >Presumably the 2.5kms on 87 or 27kHz was using USB John, or at least in >USB >bandwidths? Assuming a mode like QRSS30 or QRSS60, this would imply that >considerably further DX would be possible, even allowing for an inverse >cube >attenuation rate. > >I wonder if anyone has any lists of DX achieved using induction mode >communications? > >73s >Roger G3XBM > >On 22 February 2010 17:51, John RABSON wrote: > >> If I recall correctly, G0AKN (now SK) tried audio frequencies as well= as >73 >> and 136 kHz. G8DSU, who monitors this list, may have more information.= =20 >An >> article by G0AKN on this subject appeared in the Jan-Feb.1999 issue of >the >> AMRAD newsletter. More information may be found by searching online fo= r >> G0AKN. >> >> Most cave radio work takes place on 87kHz USB although we have sometime= s >> used frequencies as low as 27kHz. The maximum range we have achieved >with a >> 4 W transmitter is about 2 1/2 kilometres. >> >> 73 >> John Rabson >> F5VLF >> 58800 Cervon >> France >> JN17vg >> >> >> >> >> >> > > >--=20 > >http://g3xbm-qrp.blogspot.com/ >http://www.g3xbm.co.uk >http://www.youtube.com/user/G3XBM >G3XBM GQRP 1678 ISWL G11088