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 x33IJwMw005400 for ; Wed, 3 Apr 2019 20:20:04 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1hBkNA-00041U-Tc for rs_out_1@blacksheep.org; Wed, 03 Apr 2019 19:12:28 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1hBkLn-00041L-94 for rsgb_lf_group@blacksheep.org; Wed, 03 Apr 2019 19:11:03 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92) (envelope-from ) id 1hBkLg-0004j6-HS for rsgb_lf_group@blacksheep.org; Wed, 03 Apr 2019 19:10:57 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id D713F2400E5 for ; Wed, 3 Apr 2019 20:10:53 +0200 (CEST) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1554315053; bh=OZW7iQ/HPaVOboYtWkwDYVznMwc1v58tRxH5/tPPm1Y=; h=Date:From:To:Subject:From; b=g2gXKv6i5JOYvTNwUbZs8MqBgyBryetETj219RrbWrkhEuaX8CuAcRWni7RIBYQS2 lNhfqVtaNVz5xieBop6+CQpc96WWiM40q9NzR0zLTKhjl2u/MvtCApEHBlHPz67nAC MiKFhVeJeay0R2Ibd3ejgNnnjk6HKQ0Iqvb+xGmxepOQM1HZXEkYl6nSm0etxN3fMh YdWhuPdBOJhA1972Y+9wKpAi6nynT4D/Fg/sAorYIMcLGR7ZBQ7TMu2Z9iOEFdP6j6 XNd5bt/XMsP/UchZ1dk6xR28zAaWOqW1TKwi82dbU+gAho8wefkv/JnbrloyAocGIt Ylg48sVNvbslg== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 44ZDf52swhz9rxD for ; Wed, 3 Apr 2019 20:10:53 +0200 (CEST) Message-ID: <5CA4F72C.1060103@posteo.de> Date: Wed, 03 Apr 2019 20:10:52 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <5CA48798.6060900@posteo.de> In-Reply-To: X-Spam-Score: -2.3 (--) 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 the administrator of that system for details. Content preview: Hello Paul, Thank you. Interesting. For you the difference is 2.8 dB. But the loop points almost fully into your direction. The angle turned from 6 deg to 3 deg, ie. a theoretical gain of G = 20 lg(cos3/cos6) = 0 [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [185.67.36.66 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record X-Scan-Signature: 290c8768709872f914a4ca71ad6bfe49 Subject: Re: VLF: Ground loop improvements and test carrier... Content-Type: text/plain; charset=UTF-8; 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=0.0 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 Hello Paul, Thank you. Interesting. For you the difference is 2.8 dB. But the loop points almost fully into your direction. The angle turned from 6 deg to 3 deg, ie. a theoretical gain of G = 20 lg(cos3/cos6) = 0.04 dB. But i see, 1.3/1.07 < 1130/900, but not much! And maybe the QRN increased during that time. Yes, a constant return depth of the current was assumed. So, for your direction i would assume something like G = 20 lg(1130/900) = 1.98 dB. So the 2.8 dB is a good value! The propagation path should have changed mch during that short time. Amplitudes: 900m: E-field: 5.329e-07 H-field: 2.081e-06 1130m: E-field: 8.853e-07 H-field: 2.995e-06 ...calculated using vtwspec. +66% in the E field and +44% in the H-field. 73, Stefan Am 03.04.2019 18:00, schrieb Paul Nicholson: > > Stefan wrote: > > > A carrier transmission was done at 8270.1 Hz, using an antenna > > current of 2 A on both antennas. > > Received here - > > 900m Ant: T2019-03-31_13:58,+10m: 1.07fT S/N -10.4dB/1Hz > > 1130m Ant: T2019-03-31_14:12,+10m: 1.30fT S/N -7.6dB/1Hz > > The signal strength hasn't increased as much as the area has > increased. So maybe the ground return current has remained > at the same depth. Then the signal would increase as by 1130/900 > which is close to what I see here. > > Can you compare amplitude and not S/N? > > -- > Paul Nicholson > -- >