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 uBSN8NAf030210 for ; Thu, 29 Dec 2016 00:08:24 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cMNGc-00018d-SU for rs_out_1@blacksheep.org; Wed, 28 Dec 2016 23:04:18 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cMNGc-00018U-Co for rsgb_lf_group@blacksheep.org; Wed, 28 Dec 2016 23:04:18 +0000 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cMNGZ-0005fz-OU for rsgb_lf_group@blacksheep.org; Wed, 28 Dec 2016 23:04:17 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 0E2A3211F5 for ; Thu, 29 Dec 2016 00:04:11 +0100 (CET) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3tppFl4Yq6z101D for ; Thu, 29 Dec 2016 00:04:11 +0100 (CET) Message-ID: <586444EB.8050601@posteo.de> Date: Thu, 29 Dec 2016 00:04:11 +0100 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: <159377c5fb0-275f-1de09@webprd-m63.mail.aol.com> <586427B8.9060907@posteo.de> In-Reply-To: <586427B8.9060907@posteo.de> X-Scan-Signature: b77892ad90d0261eaf071f4f6cf31464 Subject: Re: VLF: New coil for 8270 Hz Content-Type: text/plain; charset=ISO-8859-15; 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 2.75 Status: O X-Status: X-Keywords: X-UID: 9984 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 >