Return-Path: Received: from rly-md04.mx.aol.com (rly-md04.mail.aol.com [172.20.29.142]) by air-md02.mail.aol.com (v126.13) with ESMTP id MAILINMD023-8fb4b1ab44322d; Sat, 05 Dec 2009 14:28:22 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-md04.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMD043-8fb4b1ab44322d; Sat, 05 Dec 2009 14:28:04 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NH0HY-0007Z9-J3 for rs_out_1@blacksheep.org; Sat, 05 Dec 2009 19:27:04 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NH0HY-0007Z0-4t for rsgb_lf_group@blacksheep.org; Sat, 05 Dec 2009 19:27:04 +0000 Received: from smarthost3.mail.uk.easynet.net ([212.135.6.13]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NH0HW-0006JS-Al for rsgb_lf_group@blacksheep.org; Sat, 05 Dec 2009 19:27:04 +0000 Received: from bb-87-82-1-60.ukonline.co.uk ([87.82.1.60] helo=[192.168.0.3]) by smarthost3.mail.uk.easynet.net with esmtp (Exim 4.69) (envelope-from ) id 1NH0HV-0001dv-V9 for rsgb_lf_group@blacksheep.org; Sat, 05 Dec 2009 19:27:02 +0000 Message-ID: <4B1AB45C.8080403@ukonline.co.uk> Date: Sat, 05 Dec 2009 19:28:28 +0000 From: Peter Dodd User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <38A51B74B884D74083D7950AD0DD85E828AAF4@File-Server-HST.hst.e-technik.tu-darmstadt.de> <1259777260.4b16acec27aa8@imp.netikka.net> <4B179D08.3030706@ukonline.co.uk> In-Reply-To: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: reducing common-mode noise Content-Type: text/plain; charset=ISO-8859-15; format=flowed 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 X-Mailer: Unknown (No Version) Hello Roelof, I used a similar one for a multiband dipole for the upper HF frequency bands but I don't think they would work for LF. Regards Peter, G3LDO > > Have you also been looking into the performance of bifiliar wound > common mode chokes, e.g. 15 turns on the popular FT-37-43 Amidon > ferrite toroid? > > These come in handy for receiver applications. > >