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[195.171.43.25]) by mx.google.com with ESMTP id ha2si3610339wib.6.2014.03.12.03.51.40 for ; Wed, 12 Mar 2014 03:51:40 -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 1WNgNg-000811-Ep for rs_out_1@blacksheep.org; Wed, 12 Mar 2014 10:27:24 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WNgNf-00080s-Ra for rsgb_lf_group@blacksheep.org; Wed, 12 Mar 2014 10:27:23 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1WNgNd-00073g-2L for rsgb_lf_group@blacksheep.org; Wed, 12 Mar 2014 10:27:22 +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 3EC933274A6 for ; Wed, 12 Mar 2014 10:25:45 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 3417328A0A6A for ; Wed, 12 Mar 2014 10:27:18 +0000 (UTC) Message-ID: <53203686.6010407@abelian.org> Date: Wed, 12 Mar 2014 10:27:18 +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 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 can report reception of some VLF signals from Dex W4DEX as WH2XBA/4 during the previous two nights. Sending OP-2H with 100W at 29500 Hz from 2014-03-11 03:00 onwards produced a signal in Todmorden which averaged 0.135 fT [...] 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: 66d07794ca19cd68f7d6cc289cd4ac18 Subject: LF: Measurements of WH2XBA/4 at 29500 and 33950 Hz 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 can report reception of some VLF signals from Dex W4DEX as WH2XBA/4 during the previous two nights. Sending OP-2H with 100W at 29500 Hz from 2014-03-11 03:00 onwards produced a signal in Todmorden which averaged 0.135 fT http://abelian.org/vlf/tmp/29500_140311a.gif http://abelian.org/vlf/tmp/29500_140311b.gif and S/N was 16.2dB in 125uHz. The transmission began at 23:00 UT with 50W carrier until 02:00 when it switched to 100W of OP-2H. The signal is only slightly weaker than WH2XBA/1 transmitting at the same time on 29499 Hz. /1 was averaging 0.146 fT over the same period. I sent the signal data to Markus DF6NM who was able to get a good deep search detection out of it: 2014-03-11 05:14:00 WH4XBA ... -55.0dBOp 100% 15.7dB Measurements ended before the signal vanished because of the appearance of military signals on a nearby frequency. Interestingly, the phase of Dex's transmission was almost constant throughout the night: http://abelian.org/vlf/tmp/29500_140311c.gif Phase bounces around +/- 25 degrees but there is no significant trend of the phase between 00:00 and 05:30. What variation there is can be attributed to noise in the 1.66mHz measurement band. Then last night Dex made a transmission at 33950 Hz. The 50W carrier appeared at 2014-03-12 03:00 UT and averaged 0.107 fT between 03:00 and 07:00 and S/N was 20.6dB in 69.4uHz bandwidth. Here too, the phase was fairly constant: http://abelian.org/vlf/tmp/33950_140312a.gif Path length WH2XBA/4 to Todmorden 53.703N 2.072W: 6194km. -- Paul Nicholson --