Return-Path: Received: from mtain-mj05.r1000.mx.aol.com (mtain-mj05.r1000.mail.aol.com [172.21.164.89]) by air-dd06.mail.aol.com (v129.4) with ESMTP id MAILINDD061-860c4d2b42503dc; Mon, 10 Jan 2011 12:30:56 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mj05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7349638000099; Mon, 10 Jan 2011 12:30:55 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PcLYu-0004d6-Nb for rs_out_1@blacksheep.org; Mon, 10 Jan 2011 17:29:44 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PcLYt-0004cx-BD for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 17:29:43 +0000 Received: from out1.ip09ir2.opaltelecom.net ([62.24.128.245]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PcLYr-0001hC-R2 for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 17:29:43 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ai8FAJDQKk1cEYrF/2dsb2JhbACSJQOSH3O7RYVMBI5E X-IronPort-AV: E=Sophos;i="4.60,302,1291593600"; d="scan'208,217";a="464293442" Received: from unknown (HELO xphd97xgq27nyf) ([92.17.138.197]) by out1.ip09ir2.opaltelecom.net with SMTP; 10 Jan 2011 17:29:35 +0000 Message-ID: <007601cbb0eb$f0ce34c0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Mon, 10 Jan 2011 17:29:31 -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: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: COILS Content-Type: multipart/alternative; boundary="----=_NextPart_000_0073_01CBB0EB.F09C2840" 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-global-disposition: G x-aol-sid: 3039400c89aa4d2b424f0967 X-AOL-IP: 195.171.43.25 ------=_NextPart_000_0073_01CBB0EB.F09C2840 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The most efficient and simple method of arriving at a required inducta= nce for a PA application is to use a tapped coil, this way you get exa= ctly the amount ot L needed. Other methods like variometers, and slug tuned coils introduce loss ie= extra lossy turns not needed, iron slugs, copper slugs alter the Q= factor also indroduce loss. Keep it simple as they say G3KEV ------=_NextPart_000_0073_01CBB0EB.F09C2840 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The most efficient and simple method= of arriving at=20 a required inductance for a PA application is to use a tapped coil, th= is way you=20 get exactly the amount ot L needed.
Other methods like variometers, and= slug tuned=20 coils introduce loss ie extra lossy turns not needed,  iron slugs= , copper=20 slugs alter the Q factor also indroduce loss.
Keep it simple as they say
G3KEV
 
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