Return-Path: X-Spam-DCC: paranoid 1102; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u4ECktUx027789 for ; Sat, 14 May 2016 14:46:55 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1b1YvP-0004QL-7I for rs_out_1@blacksheep.org; Sat, 14 May 2016 13:44:07 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1b1YvO-0004QC-VJ for rsgb_lf_group@blacksheep.org; Sat, 14 May 2016 13:44:06 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1b1YvN-0004bU-3F for rsgb_lf_group@blacksheep.org; Sat, 14 May 2016 13:44:05 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id A41092096D for ; Sat, 14 May 2016 14:44:04 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3r6RHS4H1Kz5vMK for ; Sat, 14 May 2016 14:44:04 +0200 (CEST) Message-ID: <57371D94.4090607@posteo.de> Date: Sat, 14 May 2016 14:44:04 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <5737138D.4050807@posteo.de> <57371991.28985.2A7CAE@roelof.ndb.demon.nl> In-Reply-To: <57371991.28985.2A7CAE@roelof.ndb.demon.nl> X-Scan-Signature: e09cca6d8e44a91eadbdfb3e1b8aec09 Subject: Re: LF: A transductor instead of a traditional variometer on VLF/LF/MF? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 8060 Hi Roelof, I have just completed this core out of N30 Material and 0.5mm enameled cu wire. https://dl.dropboxusercontent.com/u/19882028/VLF/20160514_143109.jpg Not ideal for 6 kHz but it is much cheaper than the ideal material and it works well too. 73, Stefan Am 14.05.2016 14:26, schrieb Roelof Bakker: > Hello Stefan, > > This will certainly work. > I have used this a long time ago to build a rf sweepgenerator with a > linear V/F characteristic. > > I gather you will need high mu ferrite. > > 73, > Roelof, pa0rdt > > >