Return-Path: Received: from mtain-da12.r1000.mx.aol.com (mtain-da12.r1000.mx.aol.com [172.29.64.84]) by air-di03.mail.aol.com (v127_r1.1) with ESMTP id MAILINDI031-eabe4baf563a113; Sun, 28 Mar 2010 09:14:34 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-da12.r1000.mx.aol.com (Internet Inbound) with ESMTP id DCDFA3800008D; Sun, 28 Mar 2010 09:14:32 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NvsIE-0001V0-9M for rs_out_1@blacksheep.org; Sun, 28 Mar 2010 14:12:42 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NvsID-0001Ur-Iq for rsgb_lf_group@blacksheep.org; Sun, 28 Mar 2010 14:12:41 +0100 Received: from lnx500.hrz.tu-darmstadt.de ([130.83.156.225]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NvsIA-0007hT-KS for rsgb_lf_group@blacksheep.org; Sun, 28 Mar 2010 14:12:41 +0100 Received: from FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de (File-Server-HST.hst.e-technik.tu-darmstadt.de [130.83.212.129]) by lnx500.hrz.tu-darmstadt.de (8.14.2/8.14.2/HRZ/PMX) with SMTP id o2SDCaHa024218 for ; Sun, 28 Mar 2010 15:12:36 +0200 (envelope-from schaefer@hst.tu-darmstadt.de) Received: from [127.0.0.1] (helo=File-Server-HST.hst.e-technik.tu-darmstadt.de) by FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de with AVK MailGateway; for ; Sun, 28 Mar 2010 15:12:34 +0200 Content-class: urn:content-classes:message MIME-Version: 1.0 X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Sun, 28 Mar 2010 15:12:34 +0200 Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1BAE@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: <38A51B74B884D74083D7950AD0DD85E82A1BAE@File-Server-HST.hst.e-technik.tu-darmstadt.de> Thread-Topic: Re: Question about ground impedance at 8.97 KHZ Thread-Index: AcrOD8a36lMyAXVHQ/OzLdKiy/WkUgAX6Ja+ References: <4BAD19D0.300@telia.com> <56DF8C4BED71466A80EB2EB1D99F6788@JimPC> <38A51B74B884D74083D7950AD0DD85E82A1BA3@File-Server-HST.hst.e-technik.tu-darmstadt.de> From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= To: X-AVK-Virus-Check: AVB 19.847;28.03.2010 X-PMX-TU: seen v0.99a by 5.5.9.388399, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2010.3.28.130048 X-PMX-SPAMCHECK: outgoing mail X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01CACE78.54A67019" Subject: LF: AW: Re: Question about ground impedance at 8.97 KHZ 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 x-aol-global-disposition: G X-AOL-VSS-INFO: 5400.1158/56809 X-AOL-VSS-CODE: clean x-aol-sid: 3039ac1d40544baf563841d5 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) ------_=_NextPart_001_01CACE78.54A67019 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear Jim, VLF, =20 >The earth system was 4 - 6, 1m long, ground rods, spaced a few metres around the feed point. That sounds very interesting and makes me hopefully to be able to decrease= my earth losses. =20 On LF, the copper plate on the ground is a fine solution for /p but on VLF= it seems not. The bad conducting stones on the way on the field give a ca= pacitive coupling to ground (with low losses on LF) but on VLF the stones= (or the bad conducting layer before reaching the ground) seem to cause si= gnificant losses. So i will try to hammer some hidden ground rods into the field and will me= asure the part of antenna current in them. I am curious about what will be= the benefit :-) =20 My goal is to reach 1A antenna current what will cause 30kV rms on the coi= l/wire and an ERP of 6,5mW. =20 73, Stefan/DK7FC =20 =20 ...>Will you prepare a TX system on the dreamers band as well? Than we cou= ld repeat our CW QSO just like on 137kHz ;-)...> Based on the experience of the last few weeks, in order to achieve anythin= g more than very short range communication, it will be neccessary for me to use the /P site I have used for the receive tests for transmission also. This requires some diplomacy with the owner of the site, who is one of my relations. I am working on it... Cheers, Jim Moritz 73 de M0BMU ------_=_NextPart_001_01CACE78.54A67019 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: base64 eJ8+IiMNAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy b3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEgAEANQAAAEFXOiBSZTogUXVlc3Rpb24g YWJvdXQgZ3JvdW5kIGltcGVkYW5jZSBhdCA4Ljk3IEtIWiAAIxEBBYADAA4AAADaBwMAHAAPAAwA IgAAAD0BASCAAwAOAAAA2gcDABwADwAMACIAAAA9AQEJgAEAIQAAADdEOUM1QjQxMUE5RjQ2NDA5 QTk1MDkzRkNBRTY5NjM5ADYHAQOQBgBIEQAAOAAAAAMANgAAAAAAQAA5ABlwplR4zsoBHgA9AAEA AAAFAAAAQVc6IAAAAAACAUcAAQAAADIAAABjPURFO2E9IDtwPUhTVDtsPUZJTEUtU0VSVkVSLUgt MTAwMzI4MTMxMjM0Wi0yMjQ3AAAAHgBJAAEAAAA1AAAATEY6IFJlOiBRdWVzdGlvbiBhYm91dCBn cm91bmQgaW1wZWRhbmNlIGF0IDguOTcgS0haIAAAAABAAE4AAHMzHg/OygEeAFoAAQAAACMAAABv d25lci1yc2diX2xmX2dyb3VwQGJsYWNrc2hlZXAub3JnAAACAVsAAQAAAGMAAAAAAAAAgSsfpL6j EBmdbgDdAQ9UAgAAAABvd25lci1yc2diX2xmX2dyb3VwQGJsYWNrc2hlZXAub3JnAFNNVFAAb3du 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