Return-Path: X-Spam-DCC: paranoid 1233; Body=3 Fuz1=3 Fuz2=3 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 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 t8DLChEl026066 for ; Sun, 13 Sep 2015 23:12:43 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZbEVs-0004if-AK for rs_out_1@blacksheep.org; Sun, 13 Sep 2015 22:08:40 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZbEVr-0004iW-B9 for rsgb_lf_group@blacksheep.org; Sun, 13 Sep 2015 22:08:39 +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 4.86) (envelope-from ) id 1ZbEUn-0007K1-62 for rsgb_lf_group@blacksheep.org; Sun, 13 Sep 2015 22:08:38 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id DB01020E1F for ; Sun, 13 Sep 2015 23:07:16 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3nDk0h4zy8z5vN8 for ; Sun, 13 Sep 2015 23:07:16 +0200 (CEST) Message-ID: <55F5E583.4040805@posteo.de> Date: Sun, 13 Sep 2015 23:07:15 +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: , <0LgZRV-1Ynhr40YD7-00nzt1@mail.gmx.com> <55F58210.25452.E34F87@mike.dennison.ntlworld.com> <55F57720.3010903@posteo.de> <003101d0ee29$20887cf0$6401a8c0@JAYDELL> <55F59E72.6030507@posteo.de> In-Reply-To: X-Scan-Signature: eeb98d9e5f7535b37e24952fd7f85252 Subject: LF: LF coil winding 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 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 4070 Hi Gary, Thanks for the ideas and links. Of course i thought about double layer winding when designing the coil on the beginning... I think i cannot afford windings beeing so close together because of the high voltages. You can't imagine... ;-) 10 kV is nothing! I want to try to use some test-tubes as a spacer and just a few double layer windings on the top of the coil. With 2 cm of distance, it coul work well i think. First i will remove 3 or 4 turns of the burnt litz wire. Then i want to try to get the same L with the shorter wire using that technique which has a better coupling and improved l/d ratio... 73, Stefan Am 13.09.2015 20:11, schrieb Gary - G4WGT: > Hi Stefan, > > Try pyramid winding, I am using this on my 136 kHz coil, saves space. > A bit tricky to do though :- > > http://www.oz8nj.dk/spoler.htm > > And my coil :- > http://myweb.tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experiments%2010.html > > 73, Gary - G4WGT. > > > -----Original Message----- From: DK7FC Sent: Sunday, September 13, > 2015 5:04 PM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: R7NT > WSPR15 > Hi Jay, > > I think the guard ring above the upper winding of the coil lost its > contact to this winding. So it was floating. Or, the contact was loose > so there was a small arc that started to burn that ring down so the > structure became more and more inhomogenious, from a E-field view. > Well, at least it worked very well since 2011! > > I want to get even better results after the maintenance. There is some > room for improvements: The diameter / length ratio has never been > optimal on that coil. I want to check if it's possible to build a > double layer coil, at least a few of the upper windings... Effort but > interesting :-) > > 73, Stefan > > Am 13.09.2015 15:35, schrieb jrusgrove@comcast.net: >> Stefan >> >> Any idea what started the meltdown? >> >> Heard someone say once: There are two types of LF ops ... those that >> have experienced fires ... and those that will ;~) . >> >> Jay W1VD WD2XNS WE2XGR/2 >> >> >> ----- Original Message ----- From: "DK7FC" >> To: >> Sent: Sunday, September 13, 2015 9:16 AM >> Subject: Re: LF: R7NT WSPR15 >> >> >>> Hi LF, >>> >>> Unfortunately my LF coil got damaged during transmitting a few weeks >>> ago. I'm soon repairing the coil and hope to join the 2200m band >>> then again. >>> >>> https://dl.dropboxusercontent.com/u/19882028/LF/20150910_193005.jpg >>> https://dl.dropboxusercontent.com/u/19882028/LF/20150910_192916.jpg >>> https://dl.dropboxusercontent.com/u/19882028/LF/20150902_182551.jpg >>> >>> 73, Stefan >>> >>> Am 13.09.2015 15:02, schrieb Mike Dennison: >>>> Alex was also a good signal with me when he sent Opera 32 last night. >>>> >>>> Mike, G3XDV >>>> ========== >>>> >>>> >>>>> Hi Alex, >>>>> >>>>> >>>>> >>>>> sorry my WSPR is on strike, no uploads. >>>>> >>>>> Made it now manually. >>>>> >>>>> >>>>> >>>>> 1745 -35 1.1 0.137603 0 R7NT KN97 53 >>>>> >>>>> 1800 -32 1.1 0.137603 0 R7NT KN97 53 >>>>> >>>>> 1815 -35 -0.2 0.137604 0 UT7GH KN66 20 >>>>> >>>>> 1845 -36 1.5 0.137603 0 R7NT KN97 53 >>>>> >>>>> 1900 -34 1.5 0.137603 0 R7NT KN97 53 >>>>> >>>>> >>>>> >>>>> 73 Joe >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> ----- >>>>> No virus found in this message. >>>>> Checked by AVG - www.avg.com >>>>> Version: 2015.0.6125 / Virus Database: 4419/10626 - Release Date: >>>>> 09/12/15 >>>>> >>>> >>>> >>>> >>> >> >> >