Return-Path: Received: from mtain-mk10.r1000.mx.aol.com (mtain-mk10.r1000.mx.aol.com [172.29.97.142]) by air-mb05.mail.aol.com (v129.4) with ESMTP id MAILINMB053-a5b94d1b0a26288; Wed, 29 Dec 2010 05:15:02 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9D3A038000084; Wed, 29 Dec 2010 05:15:00 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PXt2y-0005O2-GE for rs_out_1@blacksheep.org; Wed, 29 Dec 2010 10:14:20 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PXt2y-0005Nt-2C for rsgb_lf_group@blacksheep.org; Wed, 29 Dec 2010 10:14:20 +0000 Received: from mail-iy0-f171.google.com ([209.85.210.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PXt2v-00069f-5i for rsgb_lf_group@blacksheep.org; Wed, 29 Dec 2010 10:14:20 +0000 Received: by iyj21 with SMTP id 21so8905721iyj.16 for ; Wed, 29 Dec 2010 02:14:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=FnHN/92x+vl2aXGe6mDgyrOTzzdqXpcwiaQSP3ZT1qQ=; b=eJUyt/DhPWmk4enha3yfh5F2MdaiFCITIMPxil5om2NNvN5m6e9SeRnb3QvEgaii8K dn0ubmFqBPwRQxorJ+jwJBqqEYwEn66dJK8udL6FDDWFiPhIgGA918URcKg2xmCqIGMk Ao9HFOGa3xg3kw825bIVrWH6aB6D+3+JUjt44= 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=iIWvZyujgUoFKZWTgZ9b+nyPfy1vYYWZLBHJiCnpZQx3hLMvBtKDNzEZlaEvC1IgtD sr3DcewwokUpMJ4/zMX1TkiVZYlfgwms2bhjQSjkEYd5Kn9P8f5S+1vOzW3A5FDosJf+ 8AixVRM7LLQGSZrZyDc3e/rSwZKvTOJyvg7ZQ= MIME-Version: 1.0 Received: by 10.42.223.136 with SMTP id ik8mr14115793icb.484.1293617650639; Wed, 29 Dec 2010 02:14:10 -0800 (PST) Received: by 10.42.239.5 with HTTP; Wed, 29 Dec 2010 02:14:10 -0800 (PST) In-Reply-To: <29880.89039.qm@web28513.mail.ukl.yahoo.com> References: <29880.89039.qm@web28513.mail.ukl.yahoo.com> Date: Wed, 29 Dec 2010 10:14:10 +0000 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: VLF Loading Coil Problems - G3XIZ Content-Type: multipart/alternative; boundary=20cf30549df58aa4de049889d4f0 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-m286.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d618e4d1b0a243ea8 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --20cf30549df58aa4de049889d4f0 Content-Type: text/plain; charset=ISO-8859-1 Not am expert on large coils Chris, but could it be the former material is lossy? 73s Roger G3XBM On 29 December 2010 08:26, Chris Osborn wrote: > LF, > > Many thanks for all efforts, advice and suggestions from members of the > group. > I shall E-mail them personally within the next few days. > > I spent several hours yesterday re-winding a section of my VLF loading > coil. > There are abour 1200 turns of 0.2 mm wire which had to be hand wound at a > rate of 4 turns per minute (max). > > I was disappointed (to say the least) when the coil resonated at the > correct frequency but had a very low Q. > Either there's a short-circuit in the other section of the coil or I've > introduced a short into the newly re-wound part. > In any event I am QRT until I can sort the problem. > > I have social engagements today and will take another look at it tomorrow. > > 73 > Chris G3XIZ > > > > -- g3xbm-qrp.blogspot.com/ www.g3xbm.co.uk www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --20cf30549df58aa4de049889d4f0 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Not am expert on large coils Chris, but could it be the former material is= lossy?

73s
Roger G3XBM

On 29= December 2010 08:26, Chris Osborn <g3xiz@yahoo.co.uk> wrote:
LF,
Many thanks for all efforts, advice and suggestions from members of the gr= oup.
I shall E-mail them personally within the next few days.

I= spent several hours yesterday re-winding a section of my VLF loading coil= .
There are abour 1200 turns of=A0 0.2 mm wire which had to be hand wound at= a rate of 4 turns per minute (max).

I was disappointed (to say the= least) when the coil resonated at the correct frequency but had a very lo= w Q.
Either there's a short-circuit in the other section of the coil or I&#= 39;ve introduced a short into the newly re-wound part.
In any event I= am QRT until I can sort the problem.

I have social engagements tod= ay and will take another look at it tomorrow.

73
Chris G3XIZ






--
g3xbm-qrp.blogspot.com/=
www.g3xbm.co.= uk
www.youtub= e.com/user/g3xbm
<= /a>G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088
--20cf30549df58aa4de049889d4f0--