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 u4HIgmnq005548 for ; Tue, 17 May 2016 20:42:48 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1b2jt7-000787-Rj for rs_out_1@blacksheep.org; Tue, 17 May 2016 19:38:37 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1b2jt7-00077y-5Y for rsgb_lf_group@blacksheep.org; Tue, 17 May 2016 19:38:37 +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 1b2jt5-0006fD-J8 for rsgb_lf_group@blacksheep.org; Tue, 17 May 2016 19:38:36 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 05BAC20952 for ; Tue, 17 May 2016 20:38:31 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3r8R12606Nz5vNR for ; Tue, 17 May 2016 20:38:30 +0200 (CEST) Message-ID: <573B63CE.1080008@posteo.de> Date: Tue, 17 May 2016 20:32:46 +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: <1781998916.20160517081159@chriswilson.tv> In-Reply-To: X-Scan-Signature: aee9e5eeb35c86f052d502ac97832558 Subject: VLF: PA circuit 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: 8105 Hi VLF, JUst in case it is of interest for someone, here's an image of my VLF PA circuit that i'm using in the latest experiments: https://dl.dropboxusercontent.com/u/19882028/VLF/20160517_201732.jpg It includes the antenna coupling and antenna current measurement circuit. There will be extensions for an analog phase meter and a circuit for automatically steering the transductor to hold the resonance (automatic variometer). In a few days... 73, Stefan