Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w84NIAqE031183 for ; Wed, 5 Sep 2018 01:18:13 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fxKTe-0000al-Ro for rs_out_1@blacksheep.org; Wed, 05 Sep 2018 00:11:18 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fxKSC-0000Ye-9r for rsgb_lf_group@blacksheep.org; Wed, 05 Sep 2018 00:09:48 +0100 Received: from mout.perfora.net ([74.208.4.196]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fxKS3-00013i-1h for rsgb_lf_group@blacksheep.org; Wed, 05 Sep 2018 00:09:42 +0100 Received: from [192.168.1.127] ([72.224.159.95]) by mrelay.perfora.net (mreueus001 [74.208.5.2]) with ESMTPA (Nemesis) id 0M8gMf-1fjUrY27Nr-00w74h; Wed, 05 Sep 2018 01:09:31 +0200 To: "rsgb_lf_group@blacksheep.org" , "rsgb_lf_group@yahoogroups.co.uk" , "Discussion of the Lowfer (US, European, & UK) and MedFer bands" From: N1BUG Openpgp: preference=signencrypt Autocrypt: addr=paul@n1bug.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 Content-Language: en-US X-Provags-ID: V03:K1:mq9ZJODlHlNu7aEj+Sutqo3XxeIHdOoGsIJjv98WcwibrauR4Ii 3ndvE85Uc8jMpFB4uUwPXs4wnAH3fsidd1TkrP+9USX28itKAgt6KOi5rY3OZAGSa/b0eUx gNff1mut/i5I42oO+Duh3qOLxWva6efGodZXT1JvyUix8pMozFDf+xerH3xWvcWXUnGX07m UnarmUjPVrIs1Waf0s2+g== X-UI-Out-Filterresults: notjunk:1;V01:K0:TJmJ8ZSn0cM=:sXCpemkOax1pBtws6DUJL0 clFHcMlnUIp100J6/BLBzQtaxGehR5s2WevOyv4tFjvtZA91Whw4p4cHucI843uo2CapsHkcN 2mqlxBfNXUKwPmewo9xq4jovp3XLGPebwEnoxuuIgoZv+kcZ8NSI9nXr3JN1EP9mQYqZjXKXS lf6qjR+3/1PoVCQJ+5v6+jaGambbxqrzPlBN8Nd7/pK+6KkfG4LDxySv+rGjeVn/vL9EbK9TJ enEoUDw6IXh0k8K2IunPph2ESmfZAv2X6M+LPuBUnH1WHczlczhmri9FSt+oa8/gQ/uzH1wXj 6kS+h4vHmZ+q8ufK7xbmEijna75kZ5VkbxkksmC/kFUU/hYqBiISMUkeNI9nyhzZXBhqsjJuW sN4pwkaNUhU/y7Bnl7sqphLhFbDBTnAXTg7VNmPEQfbpoYqmOyapWFbCTV4Xom26p7IZ0BIvh xVlTzr2Pbtk5YwBy9E2Xty/OWGPLM2hNxTtzecRaRHY78aXbgiTmJDz3/WpU4g3g0rsjVM8ZL zs4f88gGpljEbtl9OzKqLD81XfL94Wzo/RwcP79Ln+aqKzufGEK06vhiVRoQgtHCDfK81YoJM Ip0/QyNKQeq3mVo7xDI1A8+KCn+o8JfU6BzmmxZdLx+h0whpIgj27jCf0b894gwHwPeRmUrBA 73bHQLOkCW9mvol8Dp5g1N54hdbONOmFHB35VoRi1eIEuWNcSXr7SIDBbU2iRz/z/wCOSyTZL GDy/JUOjipzfKsWG X-Spam-Score: -0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Subtitle: Be careful what you do in the vicinity of your LF antennas... I had a 14m length of aluminum tube (proposed 30 meter rotatable dipole) laying on the ground just under one end of the top hat of the LF antenna. Today I picked it up and moved it about 20 meters away. To get it off the ground for mowing, I ran it through the lattice of a short tower (9m) that is not at all under the LF top hat. I placed it about 2m above ground. This caused the LF antenna resonance to change so much I could not retune with the variometer! It was quite a large shift in resonant frequency. [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [74.208.4.196 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record X-Scan-Signature: 7aa9ad08848e488e22e0ff1d71f4ef1d Subject: LF: Antenna environment changes Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: *** X-Spam-Status: No, hits=3.0 required=5.0 tests=SUSPICIOUS_RECIPS 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 Subtitle: Be careful what you do in the vicinity of your LF antennas... I had a 14m length of aluminum tube (proposed 30 meter rotatable dipole) laying on the ground just under one end of the top hat of the LF antenna. Today I picked it up and moved it about 20 meters away. To get it off the ground for mowing, I ran it through the lattice of a short tower (9m) that is not at all under the LF top hat. I placed it about 2m above ground. This caused the LF antenna resonance to change so much I could not retune with the variometer! It was quite a large shift in resonant frequency. I then experimented with moving the piece of aluminum tube around. It seems I can lay it on the ground anywhere I want with no affect to the LF antenna. But put it one or two meters above ground connected to another tower or mast and the LF antenna is drastically changed. I must remember not to move any pieces of metal around while the beacon is active! :-) Paul