Return-Path: Received: (qmail 20945 invoked from network); 27 Nov 2001 08:54:53 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 27 Nov 2001 08:54:53 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 12624 invoked from network); 27 Nov 2001 08:54:43 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 27 Nov 2001 08:54:43 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 168dtX-00036i-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 27 Nov 2001 08:47:11 +0000 Received: from mail2.cc.kuleuven.ac.be ([134.58.10.50]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 168dtU-00036d-00 for rsgb_lf_group@blacksheep.org; Tue, 27 Nov 2001 08:47:08 +0000 Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mail2.cc.kuleuven.ac.be (8.12.1/8.12.1) with SMTP id fAR8kOGR083270 for ; Tue, 27 Nov 2001 09:46:25 +0100 Message-ID: <3.0.1.16.20011127094356.2c770e7c@pb623250.kuleuven.be> X-Sender: pb623250@pb623250.kuleuven.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Tue, 27 Nov 2001 09:43:56 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: Re: LF: Re: g4ftc In-reply-to: <3C0288C0.14D6154D@netscapeonline.co.uk> References: <01c175e2$5340d120$LocalHost@drawing> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: David Sparvell wrote: > I've now got almost a kilometre of 2.5mm^2 wire in my ground system, but my > system losses (including the loading coil) are still well over 100 ohms and > consequently I've having difficulties in getting the antenna current up to > much over a couple of amps. Hello David, On 136kHz the loss resistance you encounter is often much more than just groundloss. Any obstacles (trees, buildings etc...) that are relatively close to the antenna will contribute and increase the loss. I got stuck with a loss that varies from 120 Ohm in winter to 150 Ohm in summer, because of the many trees surrounding my antenna. Improving the ground system wasn't any help, doubling the radial system made the loss drop no more than a few Ohm. I'm running 450W and never got more than 2 amp through the system (typicaly 1.9A in winter, and 1.7A in summer). 73, Rik ON7YD