Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 91812380000FB; Fri, 7 Oct 2011 13:12:31 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RCDxh-0003tj-0c for rs_out_1@blacksheep.org; Fri, 07 Oct 2011 18:11:53 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RCDxg-0003tZ-J1 for rsgb_lf_group@blacksheep.org; Fri, 07 Oct 2011 18:11:52 +0100 Received: from out1.ip08ir2.opaltelecom.net ([62.24.128.244]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RCDxe-00015w-3f for rsgb_lf_group@blacksheep.org; Fri, 07 Oct 2011 18:11:52 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AlANAKYxj05cF/jU/2dsb2JhbABEgnYBkgcDkzx3D4FGAQMEAQESAQEDSQIsAggCAQYBHTkBBBoGJB0BAgIBAYU3AYItAQmYb59UhzEEh02dag X-IronPort-AV: E=Sophos;i="4.68,503,1312153200"; d="scan'208,217";a="504485714" Received: from host-92-23-248-212.as13285.net (HELO xphd97xgq27nyf) ([92.23.248.212]) by out1.ip08ir2.opaltelecom.net with SMTP; 07 Oct 2011 18:11:44 +0100 Message-ID: <001a01cc8514$2efd15c0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Fri, 7 Oct 2011 17:11:41 -0000 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: 1.2 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,SUBJ_ALL_CAPS=1.166 Subject: LF: LOADING COIL Content-Type: multipart/alternative; boundary="----=_NextPart_000_0017_01CC8514.2E66C930" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.4 required=5.0 tests=HTML_30_40,HTML_MESSAGE, SUBJ_ALL_CAPS 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-SCOLL-SCORE: 0:2:436044544:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1db4054e8f32ff7cab X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0017_01CC8514.2E66C930 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable LF/MF =20 In the 50's slim narrow loading coils were considered more efficient = than square coils. Field strength measurements confirmed this because = this type of coil became part of the vertical radiator rather than a = loading lump.=20 Worth considering when using a coil to load a vertical or inv L system = on MF es LF I suppose when thought about it makes sense, the next progession would = be a helical to make up the short fall in antenna length. de mal/g3kev ------=_NextPart_000_0017_01CC8514.2E66C930 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

LF/MF

In the 50's slim narrow loading coils were = considered more=20 efficient than square coils. Field strength measurements confirmed this = because=20 this type of coil became part of the vertical radiator rather than = a=20 loading lump.

Worth considering when using a coil to load a = vertical or=20 inv L system on MF es LF

I suppose when thought about it makes sense, = the=20 next progession would be a helical to make up the short fall in antenna=20 length.

de mal/g3kev

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