Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dl03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 33BDE38000086; Sun, 15 Jul 2012 06:51:41 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SqMPi-0001Am-7V for rs_out_1@blacksheep.org; Sun, 15 Jul 2012 11:50:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SqMPh-0001Ad-PH for rsgb_lf_group@blacksheep.org; Sun, 15 Jul 2012 11:50:57 +0100 Received: from nm25-vm2.bullet.mail.ird.yahoo.com ([212.82.109.203]) by relay1.thorcom.net with smtp (Exim 4.77) (envelope-from ) id 1SqMPg-0002TY-72 for rsgb_lf_group@blacksheep.org; Sun, 15 Jul 2012 11:50:56 +0100 Received: from [77.238.189.55] by nm25.bullet.mail.ird.yahoo.com with NNFMP; 15 Jul 2012 10:50:55 -0000 Received: from [212.82.108.224] by tm8.bullet.mail.ird.yahoo.com with NNFMP; 15 Jul 2012 10:50:55 -0000 Received: from [127.0.0.1] by omp1001.bt.mail.ird.yahoo.com with NNFMP; 15 Jul 2012 10:50:55 -0000 X-DKIM-Result: Domain=btopenworld.com Result=Signature OK X-Yahoo-Newman-Id: 378446.71411.bm@omp1001.bt.mail.ird.yahoo.com Received: (qmail 5669 invoked from network); 15 Jul 2012 10:50:55 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=DKIM-Signature:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=fma0dlYWpEnYaVGBns95+iWRW87i1qz8tv1yUgs39CIwOLEW+6FLcUf1Ihb5JTTzPPBOq7hUUNhFQLOno6x1cqTNSIy9jDUyz4tlc8JfyNyG6RevIo5p4ingprtXg06GC9YIT80yMPozQojI1qQ/iTgV3idjtXkLKundwhNhPlo= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1342349455; bh=1UmsymZ8YumzhelC7dRWinXhgyjOd8ZgmG4bjxZZ40A=; h=X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=RRDbS96ftnpEhwTK6snt8a92cTM7YccEc+KDZc7jbhTXUHQr6Yy6GLZC1/hVEoDiyDWLY7GSEoJObQ99vijvgcah4kkcNjmnPlfn2gZ1MGTfb9WqJ3FBLtad5O5D6xuFNGIZKM1bsQbQk+5r4ReTWWQWPD+giNIM0BqDdS6eXw4= X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: UTuHh5sVM1mLoNHmB362De03mx6Tvfam4Mro1EpLv6OcDjW .rzyo.QbuuH3CGSToeeRMHpUFpAfibmq5mSoTVf8fwD25tmDyNwJa4ft3IuI bxchGZKgtmRMq8GgEXTiw3DTMI7JTz_IXjWmw_g_CQUoT4X3ayAcwPlZdMKS w5uMQ5T0Y7XUrLinTHsQqkYM9UeRTkySdPtXdw838zpvbuVemVkq.iGoFJT5 ihxDFPfWRH6YMdMSzt1eUABC3SFIHs1HXlHd2RN0jAxSnMc4uaWPO01tUjYM Nr1vuapcz2oWhTR1_kMPIXwzGqN6Uq1b16__mkt8xEr1cn16YzLfdA9CRzZ1 e0ltr6ApE1YvWUQTpdhOyW67SmJHDOK5g9A5S0wOdEz0KaQ0CTsdJnA97YIJ Ot1PRnx1semYm4QGoT4NXuv0L.vilw5NpPTiIzuAe7nX2UYGEsjWG6JdYppC AyEKb X-Yahoo-SMTP: Cxhli3eswBD1ozmtAojhjrja86kWx0Qm9tycD5QR1DKWrOLgjJcXkw-- Received: from JimPC (james.moritz@86.185.202.35 with login) by smtp827.mail.ukl.yahoo.com with SMTP; 15 Jul 2012 03:50:55 -0700 PDT Message-ID: <3B859AB12854469D8EF471DFB86688D2@JimPC> From: "James Moritz" To: References: <1342348375.89359.YahooMailNeo@web29503.mail.ird.yahoo.com> In-Reply-To: <1342348375.89359.YahooMailNeo@web29503.mail.ird.yahoo.com> Date: Sun, 15 Jul 2012 11:51:06 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 X-Spam-Score: 0.2 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Dear Daniele, > 1) I recovered two unknown toroids from a TV set which included a DVD > player. Apparently they were used as common > mode chokes in the middle of > multi-wire flat cables connected between the TV main board and the DVD > player. Could > they be of some use in LF-MF circuits? [...] Content analysis details: (0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.82.109.203 listed in list.dnswl.org] 0.2 STOX_REPLY_TYPE STOX_REPLY_TYPE 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-Scan-Signature: e90dcb17768c7e768f13e0721cc1c0c7 Subject: LF: Re: OT - Two questions about toroids Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original 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=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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: 0:2:479301920:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m023.2 ; domain : btopenworld.com DKIM : fail x-aol-sid: 3039ac1d4ad15002a0bd3015 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dear Daniele, > 1) I recovered two unknown toroids from a TV set which included a DVD > player. Apparently they were used as common > mode chokes in the middle of > multi-wire flat cables connected between the TV main board and the DVD > player. Could > they be of some use in LF-MF circuits? Yes - typically EMC ferrites are fairly high permeability types that will work well in transformer applications at LF/MF. Some experimentation will be needed to determine how best to use them.... >2) More OT: I have some unused FT114-43 toroids. I wonder if they could be >used as a substitute of T80-2 toroids in >small (QRP) HF antenna tuners >that I'm planning to build for 14 MHz. No - 43-grade ferrite cores are not a substitute for the -2 grade iron dust material. The permeability of the iron dust material is much lower, and the losses when used as resonant inductors are much lower also. Cheers, Jim Moritz 73 de M0BMU