Return-Path: X-Spam-DCC: paranoid 1102; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,SUBJ_RE_NUM 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 t9UBVjwI009087 for ; Fri, 30 Oct 2015 12:31:45 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Zs7rJ-0006yW-EF for rs_out_1@blacksheep.org; Fri, 30 Oct 2015 11:28:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Zs7rI-0006yG-Ms for rsgb_lf_group@blacksheep.org; Fri, 30 Oct 2015 11:28:36 +0000 Received: from smarthost01d.mail.zen.net.uk ([212.23.1.7]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1Zs7qJ-0006BG-AK for rsgb_lf_group@blacksheep.org; Fri, 30 Oct 2015 11:28:35 +0000 Received: from [82.70.254.222] (helo=OfficeWin7.lan) by smarthost01d.mail.zen.net.uk with esmtp (Exim 4.80) (envelope-from ) id 1Zs7q5-0004mh-Uo for rsgb_lf_group@blacksheep.org; Fri, 30 Oct 2015 11:27:22 +0000 Date: Fri, 30 Oct 2015 11:27:19 +0000 From: Chris Wilson Organization: Gatesgarth Developments X-Priority: 3 (Normal) Message-ID: <12510142154.20151030112719@chriswilson.tv> To: DK7FC In-Reply-To: <56328B1F.2080901@posteo.de> References: <1981852865.20151017122027@chriswilson.tv> <1530BFEB-9BC2-4CA2-A7A3-338629A98202@me.com> <308511169.20151029202607@chriswilson.tv> <56328B1F.2080901@posteo.de> MIME-Version: 1.0 X-Originating-smarthost01d-IP: [82.70.254.222] X-Scan-Signature: 4b5b5ebe37a4c4f430f59bc35c1947b0 Subject: Re[2]: LF: Automatic variometer circuit Content-Type: text/plain; charset=us-ascii 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 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 4691 Hello Stefan, Thursday, October 29, 2015 Now that looks interesting! Could I just ask what sort of current the motor draws? And what sort of RPM it turns at and the gearing used, to give me a guide as to what I need to look for please? Thanks for posting the links. > Hi Chris, > Am 29.10.2015 21:26, schrieb Chris Wilson: >> [...] albeit my loading coil needs manual >> tweaking to move to the right part of the band. Not sure of the best >> way to remote tune it, it would be nice to have the ability to move >> about the band without running outside in the dark. I may start a >> thread about what alternatives there are, thanks again Erwin >> > I'm using a motor driven variometer which uses the phase meter circuit > of the M0BMU LF tuning meter. It is working well on LF, where my antenna > resonance is so sharp that i have to re-tune when doing QSY by 7 Hz. > See: > https://dl.dropboxusercontent.com/u/19882028/LF/LFtunemeter.pdf > https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC%20Automatic_variometer_tuner%20.jpg > https://dl.dropboxusercontent.com/u/19882028/LF/automatic_variometer_board.jpg > https://dl.dropboxusercontent.com/u/19882028/LF/LF_variometer_drive_engine_arrangement.jpg > https://dl.dropboxusercontent.com/u/19882028/LF/phase_meter.jpg > 2011 was a nice LF year for me!! :-) > 73, Stefan -- Best regards, Chris mailto:chris@chriswilson.tv