Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 78598380000AD; Fri, 16 Dec 2011 11:41:11 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RbapP-0005Jz-Ux for rs_out_1@blacksheep.org; Fri, 16 Dec 2011 16:40:11 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RbapP-0005Jq-Go for rsgb_lf_group@blacksheep.org; Fri, 16 Dec 2011 16:40:11 +0000 Received: from out1.ip05ir2.opaltelecom.net ([62.24.128.241]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RbapN-000365-4N for rsgb_lf_group@blacksheep.org; Fri, 16 Dec 2011 16:40:11 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AloBAAl0605cF/sC/2dsb2JhbABDiUeRQo5fAjqBLoEGgW0FAQEEAQgBAQNJAiYGAQEDBQIBAxEEAQEKJRQBBBoGFggGCgkKAQICAQGHaQK4PohqgxoEiAGEfCkBmXs X-IronPort-AV: E=Sophos;i="4.71,364,1320624000"; d="scan'208";a="364550427" Received: from host-92-23-251-2.as13285.net (HELO xphd97xgq27nyf) ([92.23.251.2]) by out1.ip05ir2.opaltelecom.net with SMTP; 16 Dec 2011 16:40:02 +0000 Message-ID: <007a01ccbc11$5ae51410$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <002101ccbbf1$5b23d850$0401a8c0@xphd97xgq27nyf> <003d01ccbbf3$0aae64b0$200b2e10$@com> <002f01ccbbf5$e35a9d90$0401a8c0@xphd97xgq27nyf> <003e01ccbbfc$df523080$9df69180$@com> <006401ccbc02$e19c11c0$0401a8c0@xphd97xgq27nyf> <004a01ccbc0b$a6c2fb00$f448f100$@com> Date: Fri, 16 Dec 2011 16:40:00 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: RE: Re: RE: Re: RE: Re: Wellbrook Loop Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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-SCORE: 0:2:493618784:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d404c4eeb74a75505 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Terry That wire looks ok. I use ex decca about 3mm diam but I only need about 0.5 mH of inductance for loading my inv L system. For a coil former I use a small laundry type bucket size container which has a lot of air space slots about 50% air/solid so is efficient. Litz is not really necessary. I have used 2.5 mm plastic covered elec wire preferably the fine multi strand type, or the 7 strand type. It is not that critical and Litz is probably only marginal better if you do not need too much inductance. If it helps, and keep it simple and efficient. I connect the drop wires (3 at present) from the inv L system to the top of Main Inductor as above and the bottom of winding to another small inductor about 6 ins diam in series, this inductor is tapped all the way for matching. Move wire from bottom of main inductor to a tap point down the 6 inch coil for best SWR( Resonance) then connect the coax centre wire from the shack up several turns from the bottom (earth end which is earthed or connected to some radial system) to achieve a 1:1 SWR, braid of coax is connected to bottom of coil/earth/radials etc This has always worked FB for me and appears to be efficient and simple. My earth consists of several insulated radials lying on top of ground and running across a field. One copper earth spike is incuded at base of antenna connected to radials and base of tower for lightening protection Other methods used for resonating antennas are variometers and link windings at cold end of loading coil for RF transfer. I stick to 50 ohms for the whole system, this makes it easy for testing and maintainence with existing shack test gear I hope this helps and hope to work you on CW soon on LF and MF De mal/g3kev ----- Original Message ----- From: "Terry GW0EZY" To: Sent: Friday, December 16, 2011 3:59 PM Subject: LF: RE: Re: RE: Re: RE: Re: Wellbrook Loop > Mal > > Thanks for the encouragement. Last week I installed a pulley system in a > 60ft tree in the field about 100 metres from my shack - just waiting for > weather to improve to finish the job. The next job will be building a > resonator coil. I have just seen an eBay ad for LITZ WIRE 10/44 250 ft at 15 > USD including shipping to the UK (the seller has more than 10 available). Is > this size any good for winding loading coils? > > I've not seen tin-lined plastic CH pipe, I'll look for that in the local H/W > store. > > I did walk down the private road (I think you were in Ireland at the time) > but your antennas are nicely hidden! We will be visiting Scarborough again > next year so if your invitation to call is still OK I'll let you know before > we travel. > > 73 Terry > > >