Return-Path: Received: (qmail 29503 invoked from network); 17 Dec 2002 12:39:19 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 17 Dec 2002 12:39:19 -0000 Received: (qmail 4246 invoked from network); 17 Dec 2002 12:39:19 -0000 Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 17 Dec 2002 12:39:19 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18OGzr-0002wK-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 17 Dec 2002 12:38:51 +0000 Received: from [24.153.64.2] (helo=smtp.comcast.net) by post.thorcom.com with esmtp (Exim 4.10) id 18OGzq-0002wB-00 for rsgb_lf_group@blacksheep.org; Tue, 17 Dec 2002 12:38:50 +0000 Received: from yourw92p4bhlzg (pcp02064100pcs.nrockv01.md.comcast.net [68.83.215.165]) by mtaout01.icomcast.net (iPlanet Messaging Server 5.2 HotFix 1.07 (built Nov 25 2002)) with SMTP id <0H7900BFNKCFE3@mtaout01.icomcast.net> for rsgb_lf_group@blacksheep.org; Tue, 17 Dec 2002 07:36:17 -0500 (EST) Date: Tue, 17 Dec 2002 07:36:17 -0500 From: "Ralph Lane" To: rsgb_lf_group@blacksheep.org Message-ID: <000b01c2a5c8$e50f69b0$0000a398@yourw92p4bhlzg> MIME-Version: 1.0 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-Priority: 3 X-MSMail-Priority: Normal References: <5.1.0.14.0.20021217112756.02a24720@POP3.freeler.nl> Subject: Re: LF: EARTH RESISTANCE Content-Type: text/html; charset=windows-1252 X-Spam-Status: No, hits=0.3 required=5.0tests=BIG_FONT,EMAIL_ATTRIBUTION,FROM_ENDS_IN_NUMS,MAILTO_LINK, REFERENCES,SPAM_PHRASE_00_01,SUPERLONG_LINE,USER_AGENT_OEversion=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Content-transfer-encoding: 8bit
Here is the method used to measure ground conductivity as suggested by ARRL. In our case, use RF rather than 60 hz.
 
Ralph
----- Original Message -----
Sent: Tuesday, December 17, 2002 5:35 AM
Subject: Re: LF: EARTH RESISTANCE

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