Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 97212380000B2; Mon, 5 Sep 2011 01:06:06 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R0RN2-0001qF-QP for rs_out_1@blacksheep.org; Mon, 05 Sep 2011 06:05:20 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R0RN2-0001q6-Df for rsgb_lf_group@blacksheep.org; Mon, 05 Sep 2011 06:05:20 +0100 Received: from lon1-post-2.mail.demon.net ([195.173.77.149]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R0RN0-0004bi-2y for rsgb_lf_group@blacksheep.org; Mon, 05 Sep 2011 06:05:20 +0100 Received: from sighthound.demon.co.uk ([80.177.174.126]) by lon1-post-2.mail.demon.net with esmtp (Exim 4.69) id 1R0RMz-0002Ta-aI for rsgb_lf_group@blacksheep.org; Mon, 05 Sep 2011 05:05:17 +0000 Received: from svr1 (unknown [192.168.21.4]) by svr1.twatt.home (Postfix) with ESMTP id 4BF7B1BF81 for ; Mon, 5 Sep 2011 05:05:16 +0000 (UTC) Date: Mon, 5 Sep 2011 05:05:15 +0000 From: John GM4SLV To: rsgb_lf_group@blacksheep.org Message-ID: <20110905050515.763898ec@svr1> In-Reply-To: References: <001201cc6a48$c8123dd0$0401a8c0@xphd97xgq27nyf> <20110903152500.2cbf2a9e@svr1> <9443BF673E7A4E51BBF052ADEA904B4C@JimPC> <000b01cc6a61$f7fff320$0401a8c0@xphd97xgq27nyf> <75882620F84F479F923F293AD072104F@JimPC> <001d01cc6af4$7fcd30a0$0401a8c0@xphd97xgq27nyf> Organization: The Gammy Bird X-Mailer: Claws Mail 3.7.8 (GTK+ 2.24.4; i686-pc-linux-gnu) Mime-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: 500 Khz - QSO Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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-SCOLL-SCORE: 0:2:480614848:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1db4084e6458bd1cf2 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none On Mon, 5 Sep 2011 01:08:14 +0100 "James Moritz" wrote: > Dear John, LF Group, > > This came up with field strengths at G3KEV of +7dBuV/m, and at > G3XIZ/M0JXM of -12dBuV/m, so a 19dB reduction in signal level due to > the extra distance over land Thanks Jim for quantifying the problem. That does make a compelling argument as to why Mal hears me with ease in the daytime, and Chris et al cannot. > So I guess a quiet location for GM4SLV's RX could account for being > able to receive the southern stations in Shetland, but not the other > way round. > Again, thanks for putting some figures on it, and I'm sure this accounts for the non-reciprocal nature of the propagation. The only thing will improve matters is for me to radiate higher ERP. But to redress the balance - but it looks like 10dB or more would be required. That's going to take some thinking about! Thanks John GM4SLV