Return-Path: Received: from mtain-da04.r1000.mx.aol.com (mtain-da04.r1000.mx.aol.com [172.29.64.76]) by air-da01.mail.aol.com (v128.1) with ESMTP id MAILINDA013-86394badbc9d1c9; Sat, 27 Mar 2010 04:06:53 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-da04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7194338000094; Sat, 27 Mar 2010 04:06:51 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NvR0y-0000e6-RL for rs_out_1@blacksheep.org; Sat, 27 Mar 2010 08:05:04 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NvR0y-0000dx-8p for rsgb_lf_group@blacksheep.org; Sat, 27 Mar 2010 08:05:04 +0000 Received: from fmmailgate01.web.de ([217.72.192.221]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NvR0w-0003bN-1Y for rsgb_lf_group@blacksheep.org; Sat, 27 Mar 2010 08:05:04 +0000 Received: from mwmweb077 (mwmweb077.dlan.cinetic.de [172.20.18.95]) by fmmailgate01.web.de (Postfix) with ESMTP id 5B9E5151E6855 for ; Sat, 27 Mar 2010 09:04:56 +0100 (CET) Received: from [88.76.36.135] by mwmweb077.dlan.cinetic.de with HTTP; Sat Mar 27 09:04:56 CET 2010 From: =?ISO-8859-15?Q?Horst_St=F6cker?= To: rsgb_lf_group@blacksheep.org Date: Sat, 27 Mar 2010 09:04:56 +0100 (CET) Message-ID: <14519575.800814.1269677096364.JavaMail.fmail@mwmweb077> References: <4BAC6F82.5020300@abelian.org>,, In-Reply-To: MIME-Version: 1.0 X-UI-Message-Type: mail X-UI-ATTACHMENT-ID-POSTFIX: 9219be9d-72d4-4fb9-8352-2b45bed42d28 X-Priority: 3 Importance: normal Sensitivity: Normal X-Provags-ID: V01U2FsdGVkX1+W5jVeNzp0AxThe6XP0skYrtApm9MU429g3Dr30V2WbEqlYTLJHx9d HNPXyqgpaU2BwYh1ZkI9qSUR2kUS7OD0Ciy00ADOFOqKLPsIJqpTNmeRRzjrlNpN bV2BSh9hyGhC4HbrBs9bIs/Pb2Iq0BYWzeQSY8mBjSJBBnn2O/TUIQ== X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: RE: Question about ground impedance at 8.97 KHZ Stefan. Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=PRIORITY_NO_NAME 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-sid: 3039ac1d404c4badbc9b3f0e X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello Paul, possibly 50Hz/60Hz harmonics and other noise are falsifying your measureme= nt. Horst -----Urspr=C3=BCngliche Nachricht----- Von: Rik Strobbe Gesendet: 26.03.2010 21:35:34 An: "rsgb_lf_group@blacksheep.org" Betreff: LF: RE: Question about ground impedance at 8.97 KHZ Stefan. >Paul, > >I believe that Marcus reported a loss resistance ("ground loss") of about= 1 kOhm. >For Stefan: based on 250W/0.48A the total loss resistance should be 1085= Ohm. The coil (553mH, Q=3D82) counts for 380 Ohm, so "ground loss" is abo= ut 700 Ohm. >So unless you are living on solid rock or in a desert 70 kOhm seem very= high. >Do you know the loss on 137kHz ? I guess that on 10kHz it will be 20 to= 50 times more. > >73, Rik ON7YD - OR7T > >________________________________________ >Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.o= rg] namens Paul A. Cianciolo [paulc@snet.net] >Verzonden: vrijdag 26 maart 2010 19:38 >Aan: rsgb_lf_group@blacksheep.org >Onderwerp: LF: Question about ground impedance at 8.97 KHZ Stefan. > >Hello All, > >Below is a quote from the Stefan's web page concerning his latest "Dreame= rs Band" DX contact Congratulations again Stefan. >From this information alone is it possible to calculate or know the anten= na system impedance. > > > > >"100m Vertical wire antenna, coil/antenna voltage was abt 15kV rms, avera= ge antenna current about 480mA, giving up to 1,7mW ERP. Applied power was= up to 250W." > >Pertaining to the coil "Technical and mechanical data: L=3D553mH, Q=3D82,= R(DC)=3D283 Ohm; 0,4mm diameter enameled copper wire, about 1200 turns!= Average diameter 0,55m, height abt 0,5m. So, about 2000m wire! :-)" > > > >I have built a small impedance bridge that operates at 10 KHZ and shows= my sloping 170' wire as 70K Ohms. I can also see approx 500 PF that can= be nulled out using the bridge? > >Can the 70K value possibly be correct? (3) 6' ground rods about 6' apar= t are the ground... plus the electrical ground of the house. > >I am hoping to attempt a local transmission on 9KHZ > >Any information would be helpful. > >Thank you > >Paul > >W1VLF ___________________________________________________________ WEB.DE DSL: Internet, Telefon und Entertainment f=C3=BCr nur 19,99 EUR/mtl= .! http://produkte.web.de/go/02/