Return-Path: Received: (qmail 16207 invoked from network); 4 Jun 2000 11:48:45 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by grants.core.plus.net.uk with SMTP; 4 Jun 2000 11:48:45 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12yYnf-0002fH-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 04 Jun 2000 12:42:39 +0100 Received: from ulexite.lion-access.net ([212.19.217.2]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12yYnd-0002f7-00 for rsgb_lf_group@blacksheep.org; Sun, 04 Jun 2000 12:42:37 +0100 Received: from w8k3f0 (1Cust147.tnt11.rtm1.nl.uu.net [212.136.251.147]) by ulexite.lion-access.net (I-Lab) with SMTP id F282BFB014 for ; Sun, 4 Jun 2000 10:40:59 -0100 (GMT) Message-ID: <003701bfce1a$2a24f580$93fb88d4@w8k3f0> From: "Dick Rollema" To: rsgb_lf_group@blacksheep.org References: <4.2.0.58.20000601105903.0097a890@mail.pncl.co.uk><000301bfcc87$d6d381a0$9dd699d4@w8k3f0> Subject: Re: LF: Re: Aerial tests. Date: Sun, 4 Jun 2000 11:48:43 +0200 Organization: Freeler MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2314.1300 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: To All from PA0SE In an earlier e-mail I wrote: > >Computer program AO by Brian Beezley, K6STI, shows for the L-antenna over > >medium ground an almost perfect omnidirectional radiation pattern. The > >deviation > >from a circle is no more than about 0.1dB. Mike Powell commented: > And yet did not Marconi use a vertical antenna with a long horizontal > wire to obtain directivity from Cape Race? When the original aerials > came down in a gale he found equal or stronger signal strengths using an > inverted 'L' with the arm pointing the right way. Mike, It depends on the length of the horizontal part af the antenna. Jim used only 42m. When the top is increased to 0.1 wavelength than a F/B-ratio of 2.23dB results. With a top of 0.25 wavelength F/B becomes 3.51dB. 73, Dick, PA0SE