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[195.171.43.25]) by mx.google.com with ESMTP id j4si5145119wjy.87.2013.07.14.08.51.53 for ; Sun, 14 Jul 2013 08:51:53 -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; dkim=pass header.i=@nifty.com Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UyOFe-0004UM-QM for rs_out_1@blacksheep.org; Sun, 14 Jul 2013 16:30:18 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UyOFe-0004UD-8U for rsgb_lf_group@blacksheep.org; Sun, 14 Jul 2013 16:30:18 +0100 Received: from mail.sv1.nifty.com ([220.209.183.60] helo=mxg309.nifty.com) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1UyOFb-0001c2-8v for rsgb_lf_group@blacksheep.org; Sun, 14 Jul 2013 16:30:17 +0100 Received: from HidehoDell (g176104.scn-net.ne.jp [219.117.176.104]) (authenticated) by mxg309.nifty.com with ESMTP id r6EFU5pj011620 for ; Mon, 15 Jul 2013 00:30:06 +0900 X-DKIM-Result: Domain=nifty.com Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=mar2011msa; t=1373815806; bh=84l5bK7EU2LJf7HX7d1eyD/ZiuUzHX7fWWNuf6OpJIM=; h=From:To:References:In-Reply-To:Subject:Date:Message-ID: MIME-Version:Content-Type:Content-Transfer-Encoding; b=nNokCnu1jqj/4kzeXabc4iu72qwjrO9TzJj6/x/H+8u2pfGtYMgFEuoAPlhIzZZo1 Upr6v18ZXawjMEA3SiRTHOAoZ92hbpURYbmeRendwek87rgXu25blJ4bN3I5IY6ZXS JWzNsVcM1JcnbxkihTfCvj7iOjeSzvH332b8zd8w= X-Nifty-SrcIP: [219.117.176.104] From: "Hideho YAMAMURA" To: References: <005b01ce798a$b0476600$6d01a8c0@DELL4> <20130706131640.GG5246@cs.utwente.nl> <7D6B8CBB38964C9C82487F5D0F3648FC@FMVXD1232> <20130707203537.GA30691@cs.utwente.nl> <51DA00C8.6000600@iup.uni-heidelberg.de> <51DA0212.8020808@iup.uni-heidelberg.de> <51DA03CE.6020508@iup.uni-heidelberg.de> <51DA1680.6030602@iup.uni-heidelberg.de> <51DB6CB3.2080708@iup.uni-heidelberg.de> <001601ce7c95$f235b360$6401a8c0@JAYDELL> <51DBFF7D.9050807@iup.uni-heidelberg.de> <51DC58E9.5030005@iup.uni-heidelberg.de> <51DF1D06.8020208@iup.uni-heidelberg.de> <51DF43E7.8080300@iup.uni-heidelberg.de> <51E147E2.8080302@iup.uni-heidelberg.de> <002701ce7ff5$714bc830$53e35890$@nifty.com> <51E1DDDF.3020904@iup.uni-heidelberg.de> <001501ce8098$51e6af20$f5b40d60$@nifty.com> <51E2B2D5.5090805@iup.uni-heidelberg.de> In-Reply-To: <51E2B2D5.5090805@iup.uni-heidelberg.de> Date: Mon, 15 Jul 2013 00:30:04 +0900 Message-ID: <001c01ce80a7$03d1add0$0b750970$@nifty.com> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQLC55SapAu1slb4+66RFQBzX3ItsAJcBGe4ASVx0CwCZbpuBgHuobwoAtf1SNoBtskiZgLdFZkTAj3IdOICMoOyDgG4lSV7AYlciCMBrxG5lAIZ3E1aAVO34zcCG928jQI0OK7OAqDGl84BJuOZxwMdtucsAjbDLXUBpkEl0gI8I3I1lhB2AJA= Content-Language: ja X-Spam-Score: -0.4 (/) 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: Hello Stefan, > What is the distance between the earth rods? And what is their length? > What is the distance to the shack/house/noisy earth? The first earth-point is the tower base. It's a concrete base, abut 1m square, about 2m deep, at about the bottom of the hole, 10 rods (0.9m long) are driven rather radially, before the concrete was poured. 16 ohm, at AF (820Hz) ground resistance meter. [...] Content analysis details: (-0.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [220.209.183.60 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 3b8620872b19e25fb6f4dfaf1256edc3 Subject: RE: LF: Re: MiniWhip antenna, fiber optic TEST SIGNALS NEEDED on 630m WSPR Content-Type: text/plain; charset="us-ascii" 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 Status: O X-Status: X-Keywords: X-UID: 1640 Hello Stefan, > What is the distance between the earth rods? And what is their length? > What is the distance to the shack/house/noisy earth? The first earth-point is the tower base. It's a concrete base, abut 1m square, about 2m deep, at about the bottom of the hole, 10 rods (0.9m long) are driven rather radially, before the concrete was poured. 16 ohm, at AF (820Hz) ground resistance meter. The second earth-point is copper mesh, 0.3m wide mesh was U-shaped, 15m long, buried about 0.1m-0.3m deep along the base of my house. 10ohm/AF. The closest distance to the tower is about 1m, the farthest about 7m. As the second earth-point, I tried another mesh, also 0.3m wide, 15m long, 0.1m-0.3m deep, along another edge of the base of my house, at about 8-10m away from the tower, 12.5ohm/AF, with no difference noted (for me). The last earth-point is beneath the shack, a 1m square copper plate, buried at 0.5-1.5m at about 8m away from the tower. The shack is on the ground floor. I noted errors of earth resistance values in my previous mail. Sorry. > Can you measure the coupling capacity between the shack ground and the RF ground > (coax disconnected between the earths) using a 137 kHz sine voltage? I guess the impedance between the two ground terminals would be resistive, rather than capacitive. Well, I think I can do it, but at 100kHz, using a handy LCR meter U1733C/Agilent, which is now at my friend's house, and I have to get it back. So not now.... 73s, Hideho YAMAMURA/JF1DMQ