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=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, 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 u4EDbgFI027887 for ; Sat, 14 May 2016 15:37:42 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1b1Zhl-0004hb-FG for rs_out_1@blacksheep.org; Sat, 14 May 2016 14:34:05 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1b1Zhl-0004hS-62 for rsgb_lf_group@blacksheep.org; Sat, 14 May 2016 14:34:05 +0100 Received: from fish2.hurontel.on.ca ([216.46.129.163]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1b1Zhj-0004xM-Fc for rsgb_lf_group@blacksheep.org; Sat, 14 May 2016 14:34:04 +0100 X-ASG-Debug-ID: 1463232837-0718de4b354a0b0001-a32kfu Received: from [192.168.1.102] (pppoe.dyn-216.46.157.54.hurontel.on.ca [216.46.157.54]) by fish2.hurontel.on.ca with ESMTP id Ml4UA1ixxMQRFGOt for ; Sat, 14 May 2016 09:33:58 -0400 (EDT) X-Barracuda-Envelope-From: weazle@hurontel.on.ca X-Barracuda-Apparent-Source-IP: 216.46.157.54 Mime-Version: 1.0 (Apple Message framework v1085) From: John Bruce McCreath X-ASG-Orig-Subj: Re: LF: A transductor instead of a traditional variometer on VLF/LF/MF? In-Reply-To: <5737138D.4050807@posteo.de> Date: Sat, 14 May 2016 09:33:57 -0400 Message-Id: <245E116B-93B7-4A7D-AD24-FA4B8A8898BA@hurontel.on.ca> References: <5737138D.4050807@posteo.de> To: rsgb_lf_group@blacksheep.org X-Mailer: Apple Mail (2.1085) X-Barracuda-Connect: pppoe.dyn-216.46.157.54.hurontel.on.ca[216.46.157.54] X-Barracuda-Start-Time: 1463232837 X-Barracuda-URL: https://fish.hurontel.on.ca:443/cgi-mod/mark.cgi X-Virus-Scanned: by bsmtpd at hurontel.on.ca X-Barracuda-BRTS-Status: 1 X-Barracuda-Spam-Score: 0.00 X-Barracuda-Spam-Status: No, SCORE=0.00 using global scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=5.0 tests= X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.3.29573 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- X-Scan-Signature: 4ad5f3f1a9241b934aaa5d0e23c9dc57 Content-Type: text/plain; charset=us-ascii Subject: Re: LF: A transductor instead of a traditional variometer on VLF/LF/MF? 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id u4EDbgFI027887 Status: O X-Status: X-Keywords: X-UID: 8061 I think they use something like that at the USN's big VLF transmitter NAA in Cutler, Maine, to keep the giant antenna in tune with the FSK transmissions. The same with SAQ in Grimeton, Sweden. 73, J.B., VE3EAR LowFER Beacon "EAR" 188.830 kHz. QRSS30 EN93dr