Return-Path: Received: from mtain-mp02.r1000.mx.aol.com (mtain-mp02.r1000.mx.aol.com [172.29.193.70]) by air-me10.mail.aol.com (v129.4) with ESMTP id MAILINME102-8bc54d96477f128; Fri, 01 Apr 2011 17:45:35 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 634C73800008A; Fri, 1 Apr 2011 17:45:34 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Q5m93-0007z0-DA for rs_out_1@blacksheep.org; Fri, 01 Apr 2011 22:44:41 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Q5m92-0007yr-Q3 for rsgb_lf_group@blacksheep.org; Fri, 01 Apr 2011 22:44:40 +0100 Received: from mail-iy0-f171.google.com ([209.85.210.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Q5m8z-0004pA-P7 for rsgb_lf_group@blacksheep.org; Fri, 01 Apr 2011 22:44:40 +0100 Received: by iyi20 with SMTP id 20so5784529iyi.16 for ; Fri, 01 Apr 2011 14:44:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=3PeIgohhVvewGFNNAnpGI116mCh2IXyzW06oMZtsEvg=; b=VK42nviPuuhgMbzjM8CgXd8XvX2GC18AD80NCFsBJifQPtiVOPCiwvTW0kX2Xcu7Cu nz4klhb8BCxh08XKxCOQX5cb2VKJmuTQvwmicc0TumYr9StFkk2mDrMdGHnEWciuqYk7 nwS5ve1EhgpCPPTKa9pYUh3UC/JzkUIqHWZoU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=GEXN8FjdD/fkSiWNWJu20ISPRn0ZQKrhPmnlj9Sr+IN39aasmiZ1dVSQddHg+5u3Xt 1dXL999lLZx9GQ/+XqjzAknzOpxUx2yiF0Mj4uB1fN4f51UtmzQBJfAOOo1x5hAbk/ca Vf+mTCVrVK0DlTyU2bN9iotRBPckyToIDpM6k= MIME-Version: 1.0 Received: by 10.43.57.67 with SMTP id wf3mr234519icb.164.1301694270908; Fri, 01 Apr 2011 14:44:30 -0700 (PDT) Received: by 10.42.240.129 with HTTP; Fri, 1 Apr 2011 14:44:30 -0700 (PDT) In-Reply-To: <4D9643A2.2000606@iup.uni-heidelberg.de> References: <4D9643A2.2000606@iup.uni-heidelberg.de> Date: Fri, 1 Apr 2011 22:44:30 +0100 Message-ID: From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: LF antenna progress at DK7FC Content-Type: multipart/alternative; boundary=bcaec51a86789fa856049fe2501b X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE autolearn=no version=2.63 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-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m252.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1dc1464d96477d015f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --bcaec51a86789fa856049fe2501b Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Is this for VLF Stefan or 137kHz? 73s Roger G3XBM 2011/4/1 Stefan Sch=E4fer > LF, > > I'm happy to have my LF "office" antenna almost finished. Today i connec= ted > the coil in its end position to the 90m wire in 35m height. A massive > isolator fixes the feedes which is out of copper tube. > See some photos at > > http://dl.dropbox.com/u/19882028/feeder.JPG > http://dl.dropbox.com/u/19882028/little%20isolator.JPG > http://dl.dropbox.com/u/19882028/hidden%20coil.JPG > > BTW, matching is done by using a galvanic decoupled primary coil (10 cm > diameter) inside the main LF coil (20 cm diameter) and the cable to the= PA > is CAT5 LAN cable! This is because i will chosse a H bridge as the PA wh= ich > which have main potential and i want to shield both wires which are 2x > 4insulated wires now. This may be even better than RG58 regarding skin > losses :-) > > 73, Stefan/DK7FC > > PS: I can see the antenna wire out of 800m distance :-) > > > > --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm https://sites.google.com/site/sub9khz/ G3XBM GQRP 1678 ISWL G11088 --bcaec51a86789fa856049fe2501b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Is this for VLF Stefan or 137kHz?

73s
Roger G3XBM

2011/4/1 Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de= >
LF,

I'm happy to have my LF "office" antenna almost finished. To= day i connected the coil in its end position to the 90m wire in 35m height= . A massive isolator fixes the feedes which is out of copper tube.
See some photos at

= http://dl.dropbox.com/u/19882028/feeder.JPG
http://dl.dropbox.com/u/19882028/little%20isolator.JPG
http://dl.dropbox.com/u/19882028/hidden%20coil.JPG

BTW, matching is done by using a galvanic decoupled primary coil (10 cm di= ameter) inside the main LF coil (20 cm diameter) and the cable to the PA= is CAT5 LAN cable! This is because i will chosse a H bridge as the PA whi= ch which have main potential and i want to shield both wires which are 2x= 4insulated wires now. This may be even better than RG58 regarding skin lo= sses :-)

73, Stefan/DK7FC

PS: I can see the antenna wire out of 800m distance :-)






--
http://g3xbm-qrp.blogspot.com/<= br>http://www.g3xbm.c= o.uk
http://www= .youtube.com/user/g3xbm
https://sites.google.com/site/sub9khz/
G3XBM=A0=A0 GQRP 1678= =A0=A0=A0 ISWL G11088
--bcaec51a86789fa856049fe2501b--