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[195.171.43.25]) by mx.google.com with ESMTP id h5si1392143wie.3.2014.03.09.18.36.44 for ; Sun, 09 Mar 2014 18:36:45 -0700 (PDT) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1WMod3-0007tT-G4 for rs_out_1@blacksheep.org; Mon, 10 Mar 2014 01:03:41 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WMod3-0007tK-2g for rsgb_lf_group@blacksheep.org; Mon, 10 Mar 2014 01:03:41 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1WMod0-0003Uu-Q5 for rsgb_lf_group@blacksheep.org; Mon, 10 Mar 2014 01:03:39 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id E78E0327405 for ; Mon, 10 Mar 2014 01:02:07 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id B538228A026B for ; Mon, 10 Mar 2014 01:03:37 +0000 (UTC) Message-ID: <531D0F69.4050709@abelian.org> Date: Mon, 10 Mar 2014 01:03:37 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <01dc01cf3a3f$86997bb0$93cc7310$@comcast.net>, <2FC5CAB271A6437CB35A5B100185CEDA@White> <025101cf3a52$e0925750$a1b705f0$@comcast.net> <7DB9DD5669FC4C648838510DCAC08AFB@White> <531A506E.9040103@abelian.org> <531A5C19.9060209@abelian.org> <02ba01cf3aa3$debaad50$9c3007f0$@comcast.net> <531AF126.2060600@abelian.org> <850A470A5B9F4483BED8B49D4791044A@White>,<531B1D0C.3070208@abelian.org> ,<531B4E01.7000304@abelian.org> <039f01cf3b72$bfa1db80$3ee59280$@comcast.net> <76F90E9771CA44F3981F679241E1A005@White> <03ca01cf3b92$eea24670$cbe6d350$@comcast.net> <531C64DA.5050102@abelian.org> <03e101cf3b98$3a61cef0$af256cd0$@comcast.n et> <531CC48C.9090408 @abelian.org> <047901cf3bee$0fc64120$2f52c360$@comcast.net> In-Reply-To: <047901cf3bee$0fc64120$2f52c360$@comcast.net> X-Spam-Score: 0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: I'm pretty sure now this is a propagation change. Info from Bob via PM indicates that the antenna current is essentially constant during the transmission with negligible tuning adjustments. I can think of no environmental factors around the tx that would affect signal this much without affecting antenna current. [...] Content analysis details: (0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [217.72.171.49 listed in list.dnswl.org] 0.7 SPF_NEUTRAL SPF: sender does not match SPF record (neutral) X-Scan-Signature: f38d515a9cad1e977fcfe251941a8120 Subject: Re: LF: Daytime 29.499 kHz Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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=1.3 required=5.0 tests=FROM_ENDS_IN_NUMS, UP_TO_OR_MORES 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 I'm pretty sure now this is a propagation change. Info from Bob via PM indicates that the antenna current is essentially constant during the transmission with negligible tuning adjustments. I can think of no environmental factors around the tx that would affect signal this much without affecting antenna current. I'm doubtful that freezing ground over the NY land portion of the path would have noticeable effect. Skin depth is substantial at these frequencies, tens of metres, maybe up to 100m or more, in dry rocky ground and down to 10 or fewer metres in soggy wet soil. This is the reflecting volume and a thin frozen layer at the surface isn't going to make much difference to it. That leaves propagation then. Some little shift of phase and amplitude of the modes involved, altering the interference pattern. We've seen on good nights, occasional dips of the signal which indicate some competition between modes during the night. The outcome of that competition will vary from one night to another. We'll just have to be patient, it'll come back again. There'll be times when WH2XBA/1 is coming in well and NAA is low. We could get a night that's really good. Carrier tonight until 04:00. Signal just now: 0.43 fT for 20 mins which is strongest I've seen from Bob. That'll make lines on spectrograms if it keeps up! -- Paul Nicholson --