Return-Path: Received: from rly-dc09.mx.aol.com (rly-dc09.mail.aol.com [172.19.136.38]) by air-dc03.mail.aol.com (v123.3) with ESMTP id MAILINDC033-b4049a8356f33; Fri, 27 Feb 2009 13:48:43 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dc09.mx.aol.com (v123.3) with ESMTP id MAILRELAYINDC094-b4049a8356f33; Fri, 27 Feb 2009 13:48:17 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Ld7kZ-0007H9-Qh for rs_out_1@blacksheep.org; Fri, 27 Feb 2009 18:47:55 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Ld7kZ-0007H0-Cp for rsgb_lf_group@blacksheep.org; Fri, 27 Feb 2009 18:47:55 +0000 Received: from ttsmtp-2.cpwnetworks.com ([62.24.128.243] helo=ttsmtp.cpwnetworks.com) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Ld7kY-0003V8-LS for rsgb_lf_group@blacksheep.org; Fri, 27 Feb 2009 18:47:55 +0000 X-Path: TalkTalk-smtp X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AioHAKbEp0lOkJDF/2dsb2JhbACCLi6BZIcUBstQhBQG Received: from unknown (HELO mal769a60aa920) ([78.144.144.197]) by ttsmtp.cpwnetworks.com with SMTP; 27 Feb 2009 18:47:43 +0000 Message-ID: <006001c9990b$dfc3f060$0301a8c0@mal769a60aa920> From: "mal hamilton" To: References: <003e01c99907$73421060$0301a8c0@mal769a60aa920> Date: Fri, 27 Feb 2009 18:47:43 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Karma: unknown: X-Spam-Score: 1.3 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RCVD_IN_BL_SPAMCOP_NET=1.332 Subject: LF: Re: Ground system Content-Type: multipart/alternative; boundary="----=_NextPart_000_005D_01C9990B.DF8F72E0" 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=HTML_30_40,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-IP: 193.82.116.20 ------=_NextPart_000_005D_01C9990B.DF8F72E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mechanical considerations 50turns of 5mm wire base loaded coil is more efficient than 100 turns of 1mm= wire centre or top loaded to resonate the same vertical.=20 I have experienced this on 160m mobile loading coils years ago. Of course if your vertical would take the strain of 100 turns of 10mm centre= or top loaded you would gain on Rr of maybe 0.00037 ohms on 500 khz. g3kev ----- Original Message -----=20 From: mal hamilton=20 To: rsgb=20 Sent: Friday, February 27, 2009 6:16 PM Subject: LF: Ground system MF A couple of elevated insulated radials will out perform dozens of buried r= adials, in fact 1 radial is vy effective, even insulated radials lying above= ground are also efficient.=20 I use 2 insulated 1/4 wave elevated radials on 500 khz and several lying o= n the ground for 137 khz. Using a loading coil in an elevated position on a vertical helps but remem= ber twice as many turns are required as opposed to base loading hence more r= esistance, you might not be gaining as much advantage as you think. de mal/g3kev ----------------------------------------------------------------------------= -- No virus found in this incoming message. Checked by AVG - www.avg.com=20 Version: 8.0.237 / Virus Database: 270.11.3/1975 - Release Date: 02/27/09=20= 07:05:00 ------=_NextPart_000_005D_01C9990B.DF8F72E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Mechanical considerations
50turns of 5mm wire base loaded coil is mor= e=20 efficient than 100 turns of 1mm wire centre or top loaded to resonate the sa= me=20 vertical.
I have experienced this on 160m  mobil= e=20 loading coils years ago.
Of course if your vertical would take the s= train of=20 100 turns of 10mm centre or top loaded you would gain on Rr of maybe 0.00037= =20 ohms on 500 khz.
g3kev
 
----- Original Message -----
mal= =20 hamilton
To: rsgb
Sent: Friday, February 27, 2009 6:1= 6=20 PM
Subject: LF: Ground system

MF
A couple of elevated insulated radials wi= ll out=20 perform dozens of buried radials, in fact 1 radial is vy effective, even=20 insulated radials lying above ground are also efficient.
I use 2 insulated 1/4 wave elevated radia= ls on=20 500 khz and several lying on the ground for 137 khz.
Using a loading coil in an elevated posit= ion on a=20 vertical helps but remember twice as many turns are required as opposed to= =20 base loading hence more resistance, you might not be gaining as much advan= tage=20 as you think.
de mal/g3kev
 


No virus found in this incoming message.
Checked by AVG -=20 www.avg.com
Version: 8.0.237 / Virus Database: 270.11.3/1975 - Release= =20 Date: 02/27/09 07:05:00
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