Return-Path: Received: from mtain-df02.r1000.mx.aol.com (mtain-df02.r1000.mx.aol.com [172.29.64.214]) by air-md01.mail.aol.com (v129.4) with ESMTP id MAILINMD012-8b754d94a687159; Thu, 31 Mar 2011 12:06:31 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df02.r1000.mx.aol.com (Internet Inbound) with ESMTP id F235B380000F6; Thu, 31 Mar 2011 12:06:22 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Q5KMQ-0003eJ-6C for rs_out_1@blacksheep.org; Thu, 31 Mar 2011 17:04:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Q5KMO-0003eA-Vl for rsgb_lf_group@blacksheep.org; Thu, 31 Mar 2011 17:04:36 +0100 Received: from out1.ip09ir2.opaltelecom.net ([62.24.128.245]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Q5KMM-0001FV-9D for rsgb_lf_group@blacksheep.org; Thu, 31 Mar 2011 17:04:36 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgMFAK6klE1cEYK9/2dsb2JhbACUGAORNne/Y4VrBJEA X-IronPort-AV: E=Sophos;i="4.63,276,1299456000"; d="scan'208,217";a="473470018" Received: from unknown (HELO xphd97xgq27nyf) ([92.17.130.189]) by out1.ip09ir2.opaltelecom.net with SMTP; 31 Mar 2011 17:04:27 +0100 Message-ID: <003a01cbefb4$ea478ae0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Thu, 31 Mar 2011 16:04:20 +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: loops Content-Type: multipart/alternative; boundary="----=_NextPart_000_0037_01CBEFBD.4B8B2A20" 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: 3039ac1d40d64d94a67e06b0 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0037_01CBEFBD.4B8B2A20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable My 40m loop resonated for RX on 500 khz works well but it is a poor pe= rformer on 9 khz connected directly to the sound card, I think the car= d sees it as a short cct because of the Z mismatch. Other antennas, 80m dipole and 1/4 wave 600m inv L non resonated work= well into the sound card in spite of the Z mismatch. Loops with preamps and matching transformers are a different senario= and no doubt work well. 73 de mal/g3kev ------=_NextPart_000_0037_01CBEFBD.4B8B2A20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
My 40m loop resonated for RX on 500 khz works= well=20 but it is a poor performer on 9 khz connected directly to the sou= nd=20 card, I think the card sees it as a short cct because of the= Z=20 mismatch.
Other antennas, 80m dipole and 1/4 wave 600m&n= bsp;inv L=20 non resonated work well into the sound card in spite of the&= nbsp;Z=20 mismatch.
 Loops with preamps and matching transfor= mers are a=20 different senario and no doubt work well.
73 de mal/g3kev
 
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