Return-Path: Received: (qmail 72282 invoked from network); 9 Apr 2005 08:32:23 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 9 Apr 2005 08:32:23 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DKBPg-000Ic7-2N for dave@picks.force9.co.uk; Sat, 09 Apr 2005 09:33:56 +0100 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DKBPg-000Ic4-0I for dave@picks.force9.co.uk; Sat, 09 Apr 2005 09:33:56 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim) id 1DKBS7-0006iK-LB for dave@picks.force9.co.uk; Sat, 09 Apr 2005 09:36:28 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DKBNZ-00012R-Pd for rs_out_1@blacksheep.org; Sat, 09 Apr 2005 09:31:45 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DKBNZ-00012I-6l for rsgb_lf_group@blacksheep.org; Sat, 09 Apr 2005 09:31:45 +0100 Received: from sterling.noc-servers.net ([69.93.216.2]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DKBNX-0003HH-Jl for rsgb_lf_group@blacksheep.org; Sat, 09 Apr 2005 09:31:45 +0100 Received: from [192.55.122.100] (helo=w2ksn) by sterling.noc-servers.net with esmtpa (Exim 4.50) id 1DKBNU-0000EX-Cf for rsgb_lf_group@blacksheep.org; Sat, 09 Apr 2005 04:31:40 -0400 Message-ID: <003301c53cde$ad850770$1101a8c0@w2ksn> From: "Stewart Nelson" To: rsgb_lf_group@blacksheep.org References: <001301c53cad$a55447e0$1101a8c0@w2ksn> <42574335.70801@genesiswireless.us> Date: Sat, 9 Apr 2005 01:32:32 -0700 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1478 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1478 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - sterling.noc-servers.net X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [0 0] / [47 12] X-AntiAbuse: Sender Address Domain - scgroup.com X-SPF-Result: relay.thorcom.net: 69.93.216.2 is neither permitted nor denied by domain of scgroup.com X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: Re: LF: WOLF sources Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Hi Mike and all, > By the sounds of what you wrote, WOLF could become the mode of choice > for crossing the pond with a Part 15 signal level. I'd very much like to see that happen, but ... If we had conditions similar to US lowfers, with just a second hop added, then I believe it would be workable. However, going west to east, you have some very strong LF broadcast stations to contend with. They are spaced 9 kHz or less, so you can't put your signal more than 4.5 kHz from one of those carriers. I've been told that the sideband energy is typically many dB above (quiet) atmospheric noise level. It might be possible to choose a special time, e.g. when the broadcast station is off the air for maintenance, but it would be much less likely to find good propagation with such an additional constraint. Going east to west, it's probably not legal to Tx near 190 kHz. If you had to use 136 kHz, the lower antenna efficiency and higher noise level would be a significant disadvantage. Any ideas for mitigating these problems? 73, Stewart KK7KA