Return-Path: X-Spam-DCC: paranoid 1233; 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=-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 tAKMfHia011373 for ; Fri, 20 Nov 2015 23:41:17 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZzuJt-0001qV-KW for rs_out_1@blacksheep.org; Fri, 20 Nov 2015 22:38:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZzuJt-0001qM-A6 for rsgb_lf_group@blacksheep.org; Fri, 20 Nov 2015 22:38:17 +0000 Received: from smarthost03a.mail.zen.net.uk ([212.23.1.20]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ZzuIr-0005ac-Et for rsgb_lf_group@blacksheep.org; Fri, 20 Nov 2015 22:38:16 +0000 Received: from [82.70.254.222] (helo=OfficeWin7.lan) by smarthost03a.mail.zen.net.uk with esmtp (Exim 4.80) (envelope-from ) id 1ZzuIb-0002dN-Ih for rsgb_lf_group@blacksheep.org; Fri, 20 Nov 2015 22:36:57 +0000 Date: Fri, 20 Nov 2015 22:36:57 +0000 From: Chris Wilson Organization: Gatesgarth Developments X-Priority: 3 (Normal) Message-ID: <299444874.20151120223657@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-smarthost03a-IP: [82.70.254.222] X-Scan-Signature: 5f132ffce194fb93f2267a462d849f2b 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: 5233 Hello DK7FC, Thursday, October 29, 2015 I have breadboarded the motor drive circuit and tested it with 2 one and a half volt cells centre tapped and 1k pot to simulate the phase change input. The drive motor works fine, and lowering the voltage to say 7V it moves the variometer REALLY slowly. I am now about to build the phase meter part of the antenna circuit. Do I need to isolate the phase meter ground with say a 470pF parallelled with a 0.1uF to true ground? Thanks. > 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 2E0ILY mailto:chris@chriswilson.tv