Return-Path: Received: from mtain-mb09.r1000.mx.aol.com (mtain-mb09.r1000.mx.aol.com [172.29.96.29]) by air-ma01.mail.aol.com (v128.3) with ESMTP id MAILINMA012-b4f04bcc6f62e2; Mon, 19 Apr 2010 10:57:38 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mb09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7D6A4380000DE; Mon, 19 Apr 2010 10:57:34 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1O3sOh-0006PG-R8 for rs_out_1@blacksheep.org; Mon, 19 Apr 2010 15:56:27 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1O3sOh-0006P7-EW for rsgb_lf_group@blacksheep.org; Mon, 19 Apr 2010 15:56:27 +0100 Received: from out1.ip07ir2.opaltelecom.net ([62.24.128.243]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1O3sOf-0002oa-Cj for rsgb_lf_group@blacksheep.org; Mon, 19 Apr 2010 15:56:27 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AmQFAGcLzEtcGOPi/2dsb2JhbACMdQOIV4YncbwkhRAE X-IronPort-AV: E=Sophos;i="4.52,236,1270422000"; d="scan'208,217";a="445933765" Received: from unknown (HELO xphd97xgq27nyf) ([92.24.227.226]) by out1.ip07ir2.opaltelecom.net with SMTP; 19 Apr 2010 15:56:17 +0100 Message-ID: <002f01cadfd0$76473450$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Mon, 19 Apr 2010 15:56:15 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: EARTH Content-Type: multipart/alternative; boundary="----=_NextPart_000_002C_01CADFD8.D7A51250" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE 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: 3039ac1d601d4bcc6f5e7cfc X-AOL-IP: 193.82.116.20 ------=_NextPart_000_002C_01CADFD8.D7A51250 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable LF/MF At the average radio amateurs QTH the EARTH is a very variable factor,= and no doubt some sort of earth system is desirable, but some get par= anoid about their earth wires, rods etc. The important criteria is a good antenna system, the best that can be= erected given limations around the QTH, spread a few insulated radial= s out around the base of antenna, and odd earth rod might help.=20 The efficiency and labour involved engineering elaborate earth systems= results in diminishing returns. In reality going from 6 radials to 60 only results in maybe 1 dB if yo= u are lucky, especially at LF/MF Get a 1/4 wave inv L or T antenna erected and a couple of radials and= notice the difference, ie lots of earth wires especially buried and= a poor antenna is not a substitute de mal/g3kev =20 ------=_NextPart_000_002C_01CADFD8.D7A51250 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

LF/MF

At the average radio amateurs QTH the= EARTH is a=20 very variable factor, and no doubt some sort of earth system is desira= ble, but=20 some get paranoid about their earth wires, rods etc.

The important criteria is a good ante= nna system,=20 the best that can be erected given limations around the QTH, spread a= few=20 insulated radials out around the base of antenna, and odd earth rod mi= ght help.=20

The efficiency and labour involved en= gineering=20 elaborate earth systems results in diminishing returns.

In reality going from 6 radials to 60= only results=20 in maybe 1 dB if you are lucky, especially at LF/MF

Get a 1/4 wave inv L or T antenn= a erected and=20 a couple of radials and notice the difference, ie lots of earth wires= especially=20 buried and a poor antenna is not a substitute

de mal/g3kev

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