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[195.171.43.25]) by mx.google.com with ESMTP id oh2si2148598wic.17.2013.12.19.11.02.20 for ; Thu, 19 Dec 2013 11:02:21 -0800 (PST) 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; dkim=fail (test mode) header.i=@comcast.net Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Vtikz-0002iJ-63 for rs_out_1@blacksheep.org; Thu, 19 Dec 2013 18:55:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Vtiky-0002iA-Ea for rsgb_lf_group@blacksheep.org; Thu, 19 Dec 2013 18:55:36 +0000 Received: from qmta03.emeryville.ca.mail.comcast.net ([76.96.30.32]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1Vtiku-0000H4-Nb for rsgb_lf_group@blacksheep.org; Thu, 19 Dec 2013 18:55:35 +0000 Received: from omta16.emeryville.ca.mail.comcast.net ([76.96.30.72]) by qmta03.emeryville.ca.mail.comcast.net with comcast id 3Vd71n0051ZMdJ4A3WvVtV; Thu, 19 Dec 2013 18:55:30 +0000 Received: from Owner ([166.137.182.53]) by omta16.emeryville.ca.mail.comcast.net with comcast id 3Wv81n00P19Y0ty8cWvEUd; Thu, 19 Dec 2013 18:55:24 +0000 From: "hvanesce" To: References: <52B32653.6000506@psk31.plus.com> In-Reply-To: <52B32653.6000506@psk31.plus.com> Date: Thu, 19 Dec 2013 11:54:29 -0700 Message-ID: <015c01cefceb$d6f52ff0$84df8fd0$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQGQIg70pvybqvP+R6cz63yEGZQAHZrZh1Iw Content-Language: en-us DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20121106; t=1387479330; bh=kvQoKt1q1mSMTuMQ++xuTwGhewzJUpPMMVCAINCIpoI=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=Ng+cJNJ03ggFqaPujmeKNPSqHcDtkctKXp98e6mh3LeldUVw/MB7uU0SgHa/x6/hC rqg5ijvKu07h66yZJMAHX0JGWt+7kCPZo2CLdF1yv6RL9drBEXcWfsK9bm+LKhE0Hj EBAxbxED4w1gRxnCBuvjobe+Amou8Iqw1nlrix3PmORGUlCUzaZS7UDNo/feg83xqX Y+AkTO+VhETQh6f9DeFTejJzWGJ3T57qBkswOhUr+9Bw3gNT7EPnrcPXVZEdOVCdHm WWVAmTG5Ocx8wqmXYJUc0U13yI80aGnd4Eh4cRUcBc8q73L6C7l9SvBB8eVa1NGPi7 gVJ28gYNDsVag== X-Spam-Score: -0.5 (/) 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 am out of range (Arizona this weekend) for your experiment, but interested. I have carefully measured infrastructure effects (including buried utilities and other utilities), and have coincidentally seen roughly 6km range (at VLF frequencies) in a scenario that is somewhat similar. For what it's worth I found steep field gradients near 3km-6km (infrastructure and topology dependent) in four directions, and did not have time or RX dynamic range to determine whether these gradients were associated with multi-modal interference nulls, utility decouplers, or simply extinction of the reactive field. I hope to extend my RX dynamic range by ~ 20dB in the near future, and will repeat these measurements (at ranges > 6km) at that time. [...] Content analysis details: (-0.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [76.96.30.32 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (hvanesce[at]comcast.net) -0.0 SPF_PASS SPF: sender matches SPF record -0.5 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 80e63e173fa93b7854d61e1697120204 Subject: LF: RE: 8.9758KHz Earth Mode Test 21st Dec. Content-Type: multipart/related; boundary="----=_NextPart_000_015D_01CEFCB1.2A974250" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE 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 Status: O X-Status: X-Keywords: X-UID: 736 This is a multipart message in MIME format. ------=_NextPart_000_015D_01CEFCB1.2A974250 Content-Type: multipart/alternative; boundary="----=_NextPart_001_015E_01CEFCB1.2A974250" ------=_NextPart_001_015E_01CEFCB1.2A974250 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I am out of range (Arizona this weekend) for your experiment, but interested. I have carefully measured infrastructure effects (including buried utilities and other utilities), and have coincidentally seen roughly 6km range (at VLF frequencies) in a scenario that is somewhat similar. For what it's worth I found steep field gradients near 3km-6km (infrastructure and topology dependent) in four directions, and did not have time or RX dynamic range to determine whether these gradients were associated with multi-modal interference nulls, utility decouplers, or simply extinction of the reactive field. I hope to extend my RX dynamic range by ~ 20dB in the near future, and will repeat these measurements (at ranges > 6km) at that time. Does your infrastructure broaden your signal and/or add spurs? I suppose you can't know this until your test is underway, but it might be helpful for others to eventually know this, on the chance that some infrastructure resonating off center frequency has a large aperture and could therefore be detected more easily than the fundamental at ranges > 6km*. At 50V, 1.5A (~ 33 ohms) do you think that you are losing any current to undesired paths? Best of luck on your tests. 73, Jim AA5BW * (given your antenna contact separation, it seemed that infrastructure aperture might be significant compared to coupling between your earth loop and the infrastructure, for RX separations > 6km, at which distance the reactive field may be giving way to aperture-dependent quasi-static and radiative field components) From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of g3zjo Sent: Thursday, December 19, 2013 10:01 AM To: rsgb_lf_group@blacksheep.org Subject: LF: 8.9758KHz Earth Mode Test 21st Dec. G3MFW has problems posting to the Groups at the moment, I have received the following from him. I have been experimenting with earth systems for some years. I now use the house water pipes and an array of 11 copper earth rods and buried sheet in parallel, 30 metres away at the bottom of the garden. At 8.9758 (crystal) I pass 1.5 amps at 50 volts RMS. I have made a reception map around Truro, Cornwall, at 1.46Hz bandwidth using a 41 turn horizontal loop on the car roof rack, supplemented by using the same loop on the ground. Ranges vary greatly with topography and earth conditions, but are up to 6 Km with buried utilities assistance. I will transmit this Saturday, 21st Dec, from 9.00 to 10.15 am using QRSS 3 with endless dashes. I would be most grateful if you would report any reception using narrow bandwidths. I must be exciting several square kilometres of buried utilities - surely SOMETHING must be radiated! I can repeat the test at any time upon request. Harry Woodhouse, G3MFW _____ Image removed by sender. This email is free from viruses and malware because avast! Antivirus protection is active. ------=_NextPart_001_015E_01CEFCB1.2A974250 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I am out of range (Arizona this weekend) for your experiment, but = interested. I have carefully measured infrastructure effects (including = buried utilities and other utilities), and have coincidentally seen = roughly 6km range (at VLF frequencies) in a scenario that is somewhat = similar. For what it’s worth I found steep field gradients near = 3km-6km (infrastructure and topology dependent) in four directions, and = did not have time or RX dynamic range to determine whether these = gradients were associated with multi-modal interference nulls, utility = decouplers, or simply extinction of the reactive field. I hope to extend = my RX dynamic range by ~ 20dB in the near future, and will repeat these = measurements (at ranges > 6km) at that time.

 

Does your infrastructure broaden your signal and/or add spurs? I = suppose you can’t know this until your test is underway, but it = might be helpful for others to eventually know this, on the chance that = some infrastructure resonating off center frequency has a large aperture = and could therefore be detected more easily than the fundamental at = ranges > 6km*.

 

At 50V, 1.5A  (~ 33 ohms) do you think that you are losing any = current  to undesired paths?

 

Best of luck on your tests.

 

73, Jim AA5BW

 

*  (given your antenna contact separation, it seemed that = infrastructure aperture might be significant compared to coupling = between your earth loop and the infrastructure, for RX separations > = 6km, at which distance the reactive field may be giving way to = aperture-dependent quasi-static and radiative field = components)

 

From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of = g3zjo
Sent: Thursday, December 19, 2013 10:01 = AM
To: rsgb_lf_group@blacksheep.org
Subject: LF: = 8.9758KHz Earth Mode Test 21st Dec.

 

G3MFW has = problems posting to the Groups at the moment, I have received the = following from him.


I have been = experimenting with earth systems for some years. I now use the house = water pipes and an array of 11 copper earth rods and buried sheet in = parallel, 30 metres away at the bottom of the garden. At 8.9758 = (crystal) I pass 1.5 amps at 50 volts RMS. I have made a reception map = around Truro, Cornwall, at 1.46Hz bandwidth using a 41 turn horizontal = loop on the car roof rack, supplemented by using the same loop on the = ground. Ranges vary greatly with topography and earth conditions, but = are up to 6 Km with buried utilities assistance.

I will transmit this = Saturday, 21st Dec, from 9.00 to 10.15 am using QRSS 3 with = endless dashes. I would be most grateful if you would report any = reception using narrow bandwidths. I must be exciting several square = kilometres of buried utilities – surely SOMETHING must be = radiated! I can repeat the test at any time upon = request.

 

Harry Woodhouse, = G3MFW



3D"Image

This email is = free from viruses and malware because avast! Antivirus protection is = active.

 

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