Return-Path: Received: (qmail 23665 invoked from network); 10 May 2001 23:20:40 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 10 May 2001 23:20:40 -0000 Received: (qmail 19050 invoked from network); 10 May 2001 23:20:00 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 10 May 2001 23:20:00 -0000 X-Priority: 3 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14xzdI-00036y-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 11 May 2001 00:14:08 +0100 X-MSMail-Priority: Normal Received: from whirlwind.netspace.net.au ([203.10.110.76]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14xzdG-00036t-00 for rsgb_lf_group@blacksheep.org; Fri, 11 May 2001 00:14:07 +0100 Received: from fred1 (dialup-t1-153.Hobart.netspace.net.au [210.15.196.153]) by whirlwind.netspace.net.au (8.11.1/8.11.1) with SMTP id f4ANDU063607 for ; Fri, 11 May 2001 09:13:31 +1000 (EST) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3.0.6.32.20010511091053.009224e0@pop.netspace.net.au> X-Sender: vk7ro@pop.netspace.net.au X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.6 (32) Date: Fri, 11 May 2001 09:10:53 +1000 To: rsgb_lf_group@blacksheep.org From: "Richard Rogers" Subject: Re: LF: harmonics / LF antenna In-reply-to: <3.0.1.16.20010510132736.2c87c87a@mail.cc.kuleuven.ac.be> References: <004401c0d92c$0f19a060$af6e74d5@w8k3f0> <65AECDF1F89AD411900400508BFC869F9C0491@pdw-mail-1.dera.gov.uk> <3AFA2E4C.EBB3C4EF@alg.demon.co.uk> 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: G'day, Robert, AX2TAR, tried his switch mode LF transmitter without a low pass filter. His 3rd harmonic was just visible on Argo, but his 19th harmonic at about 3.3MHz was S9 here about 10km away. The 19th harmonic was probably where his wire was a halfwave long and excited via the stray capacitance across his loading coil. 73, Ric, VK7RO