Return-Path: Received: from rly-md08.mx.aol.com (rly-md08.mail.aol.com [172.20.29.146]) by air-md10.mail.aol.com (v121_r4.4) with ESMTP id MAILINMD102-9194943958712e; Sat, 13 Dec 2008 05:59:28 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-md08.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINMD081-9194943958712e; Sat, 13 Dec 2008 05:59:21 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LBSCv-0006fG-Pk for rs_out_1@blacksheep.org; Sat, 13 Dec 2008 10:58:49 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LBSCv-0006f7-BX for rsgb_lf_group@blacksheep.org; Sat, 13 Dec 2008 10:58:49 +0000 Received: from smtp802.mail.ird.yahoo.com ([217.146.188.62]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1LBSCu-0003h9-Ab for rsgb_lf_group@blacksheep.org; Sat, 13 Dec 2008 10:58:49 +0000 Received: (qmail 65469 invoked from network); 13 Dec 2008 10:58:42 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:Received:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=bZKJ17hQqNPIHnSpYmK28i/vClwoqsCYNk9M9Ombv1pjCk/1X1xhwRp0NQ2Urmrk54rVHkqumS6BGoJzAub8SZMwz/Azu7wwzI3RUvn0mj0nSxO+cUywfBVCzWOhaWbNzZI39BOGiRYQgkzMGNJTlNlZsMVB04irFDCzc7YZwTk= ; Received: from unknown (HELO w4o8m9) (james.moritz@86.134.108.92 with login) by smtp802.mail.ird.yahoo.com with SMTP; 13 Dec 2008 10:58:42 -0000 X-YMail-OSG: 8CqD8yAVM1k6QUzsf1tII6QXHJLsEMWyVbBZl2wE5VuZPmKM8R6YXcHfTU5f6mRm9wlW3GjJE7XGyhVzGNR.MCK3Ec_o82DHRYkHj3VSHTANHAQEqHyHF5m0inq63v0dMwknQoCU2eXcVWUYbEAF5uEwyn3im9dOch7AUIdvHPXuVZecqBcgnm_smFGKw3t9YzmOVxg49xxD2sLPXEpxr5VKDdWNC4Qq X-Yahoo-Newman-Property: ymail-3 Received: from 127.0.0.1 (AVG SMTP 7.5.552 [270.9.17/1846]); Fri, 12 Dec 2008 10:58:04 +0000 Message-ID: <000701c95c48$823ff4c0$4201a8c0@home> From: "James Moritz" To: Date: Fri, 12 Dec 2008 10:58:03 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Bandpass loops mk2 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 I have recently uploaded a pdf file, "BPloops2.pdf", with an article describing loop receiving antennas I have built recently for the 500kHz and 136kHz bands, to the UK500kHz google group site ( http://groups.google.co.uk/group/uk500khz , then select "files" from the menu). These designs are an update of the "Bandpass loops" article I wrote some years ago (still available from G3YXM's "features" page). They are 1 metre square single turn loops with an element made of copper water pipe. They have a bandpass characteristic, to give coverage of the amateur band plus a bit more without re-tuning, while at the same time giving useful rejection of out-of-band signals. With the preamp also described in the article, they are sensitive enough to hear the band noise under quiet band conditions. There is also a switched dual-band version. If you can't access the UK500kHz group for some reason, let me know and I will send the file direct. Hope this is of interest - Any comments welcome, Cheers, Jim Moritz 73 de M0BMU