Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id uBU0nw8v002037 for ; Fri, 30 Dec 2016 01:49:59 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cMlKh-0006en-Uj for rs_out_1@blacksheep.org; Fri, 30 Dec 2016 00:46:07 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cMlKh-0006ee-An for rsgb_lf_group@blacksheep.org; Fri, 30 Dec 2016 00:46:07 +0000 Received: from simone.ucs.mun.ca ([134.153.232.76]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.87) (envelope-from ) id 1cMlKe-0002nl-4N for rsgb_lf_group@blacksheep.org; Fri, 30 Dec 2016 00:46:06 +0000 Received: from plato.ucs.mun.ca (plato.ucs.mun.ca [134.153.232.153]) by simone.ucs.mun.ca (8.13.8/8.13.8) with ESMTP id uBU0jkx1008199 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 29 Dec 2016 21:15:56 -0330 Date: Thu, 29 Dec 2016 21:15:50 -0330 (NST) From: jcraig@mun.ca X-X-Sender: jcraig@plato.ucs.mun.ca To: rsgb_lf_group@blacksheep.org In-Reply-To: <586444EB.8050601@posteo.de> Message-ID: References: <159377c5fb0-275f-1de09@webprd-m63.mail.aol.com> <586427B8.9060907@posteo.de> <586444EB.8050601@posteo.de> MIME-Version: 1.0 X-Scan-Signature: 1708620d3ce65bee0beaaede7929769a Subject: Re: VLF: New coil for 8270 Hz Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed 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 2.75 Status: O X-Status: X-Keywords: X-UID: 10004 Hi Stefan, I built the VLF E-probe designed by DK7FC. Your design seems to work well on 8.277 kHz. There is also a VLF preamp in the shack. 73 Joe On Thu, 29 Dec 2016, DK7FC wrote: > BTW Joe, > > Would you set up a VLF grabber / monitoring station on your side to receive > signals from DL? It is a bit easier i think, no pilot tones and such stuff. > Direct reception with a simple soundcard. You will however need to build a > preamp and low pass filters and such stuff... > > 73, Stefan > > Am 28.12.2016 21:59, schrieb DK7FC: >> >> >> Am 28.12.2016 19:00, schrieb jcraig@mun.ca: >>> PS Stefan's coil is very compact. 0,4 mm wire? Hope it can take the kV! >> >> Hi Joe, >> >> Yes, 0.4mm wire. The voltage is not the problem for the wire. But the tube >> is out of PVC and the length of the winding is about 0.3m. So it will be >> about 1kV/cm which could be problematic if the inner side of the tube >> becomes wet, inhomogeneous wet. This could cause strong local E field >> strength which leads to arcing on the surface. Arcing on the surface makes >> the surface conductive, a self accelerating process that can be repaired. >> This is the high risk of this construction! It has its advantages and >> disadvantages. It will handle 700 mA RF current, at least now in winter :-) >> But i should take care to keep it as dry as possible. We will see what >> happens. >> >> 73, Stefan >> > >