Return-Path: Received: (qmail 4486 invoked from network); 17 Dec 2002 10:32:33 -0000 Received: from netmail02.services.quay.plus.net (212.159.14.221) by mailstore with SMTP; 17 Dec 2002 10:32:33 -0000 Received: (qmail 25790 invoked by uid 10001); 17 Dec 2002 10:32:13 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by netmail02.services.quay.plus.net with SMTP; 17 Dec 2002 10:32:13 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18OF0R-0002UD-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 17 Dec 2002 10:31:19 +0000 Received: from [213.218.77.56] (helo=cmailENV4.svr.pol.co.uk) by post.thorcom.com with esmtp (Exim 4.10) id 18OF0Q-0002U4-00 for rsgb_lf_group@blacksheep.org; Tue, 17 Dec 2002 10:31:18 +0000 Received: from [62.21.150.69] (helo=w8k3f0.freeler.nl) by cmailENV4.svr.pol.co.uk with esmtp (Exim 3.35 #1) id 18OF0P-0002IZ-00 for rsgb_lf_group@blacksheep.org; Tue, 17 Dec 2002 10:31:18 +0000 Message-ID: <5.1.0.14.0.20021217112756.02a24720@POP3.freeler.nl> X-Sender: FRE0000086604@POP3.freeler.nl X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Tue, 17 Dec 2002 11:35:18 +0100 To: rsgb_lf_group@blacksheep.org From: "Dick Rollema" In-reply-to: <003901c2a5b1$cd847680$4d6a0450@oemcomputer> References: MIME-Version: 1.0 Subject: Re: LF: EARTH RESISTANCE Content-Type: text/html; charset=windows-1252 X-Spam-Status: No, hits=-2.1 required=5.0tests=BIG_FONT,EMAIL_ATTRIBUTION,IN_REP_TO,REFERENCES, SPAM_PHRASE_01_02version=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Content-transfer-encoding: 8bit To All from PA0SE

Mike, G3XDV, wrote:

I think this is why people are confused. I believe that Dick measured
"system loss", which includes all losses except inductor loss. Calling it
"earth resistance" simplifies the situation too much. Plainly a wet
environment will increase leakages.

I indeed measured the total resistance of the aerial system (minus the coil loss) as I have explained in my e-mail. I agree with Mike that "system loss" would have been a better expression than "earth resistance".  


Has anyone measured earth resistance alone under different conditions? If I
recall correctly, this can be done with three earth stakes and Kirchoff's
laws.


Indeed, but it usually done at 50Hz. To be meaningful at LF the measurement should be performed at an LF frequency. But I'm afraid that will not be so simple.

73, Dick, PA0SE