Return-Path: <majordom@post.thorcom.com> Received: (qmail 7371 invoked from network); 6 Jun 2001 08:45:53 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 6 Jun 2001 08:45:53 -0000 Received: (qmail 183 invoked from network); 6 Jun 2001 08:45:27 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 6 Jun 2001 08:45:27 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 157YpM-0002Bt-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 06 Jun 2001 09:38:08 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from [213.2.16.106] (helo=rsgb.org.uk) by post.thorcom.com with esmtp (Exim 3.16 #2) id 157YpH-0002Bn-00 for rsgb_lf_group@blacksheep.org; Wed, 06 Jun 2001 09:38:03 +0100 Received: from miked by rsgb.org.uk with SMTP (MDaemon.PRO.v4.0.0.R) for <rsgb_lf_group@blacksheep.org>; Wed, 06 Jun 2001 09:35:10 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 From: "Mike Dennison" <mike.dennison@rsgb.org.uk> To: rsgb_lf_group@blacksheep.org Date: Wed, 6 Jun 2001 09:35:08 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: LF: RE: Re. 73KHz T/A Message-ID: <3B1DF94C.12607.E8FD2@localhost> In-reply-to: <7D653C9C42F5D411A27C00508BF8803D55C4B6@pdw-mail-r1.dstl.gov.uk> X-Mailer: Pegasus Mail for Win32 (v3.12c) X-Return-Path: miked@mail X-MDaemon-Deliver-To: rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: <majordom@post.thorcom.com> > Could this path be enhanced by the Earth / Ionosphere waveguide > propagation mode, prevalent at lower frequencies. I know it is rather too high > frequency to be normally considered for this mode, but with a D layer 'height' > of around 75km (is that right ?) the waveguide guide width is something like 8 > wavelengths so something may be feasible. > Andy G4JNT I had always understood that you needed gigantic powers to get into this mode, but once there the path losses were very small. Congratulations to Laurie and John. Are there any pictures? Mike, G3XDV (IO91VT) http://www.lf.thersgb.net