Return-Path: Received: (qmail 3672 invoked from network); 1 Oct 2001 11:36:38 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 1 Oct 2001 11:36:38 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 27882 invoked from network); 1 Oct 2001 11:36:19 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 1 Oct 2001 11:36:19 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15o1HX-0001wU-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 01 Oct 2001 12:30:43 +0100 Received: from e24.nc.us.ibm.com ([32.97.136.230]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15o1HV-0001vv-00 for rsgb_lf_group@blacksheep.org; Mon, 01 Oct 2001 12:30:42 +0100 Received: from southrelay01.raleigh.ibm.com (southrelay01.raleigh.ibm.com [9.37.3.208]) by e24.nc.us.ibm.com (8.9.3/8.9.3) with ESMTP id GAA26992 for ; Mon, 1 Oct 2001 06:23:57 -0500 Received: from usa.net (ss9.bld.socks.ibm.com [9.14.4.75]) by southrelay01.raleigh.ibm.com (8.11.1m3/NCO v4.97.1) with ESMTP id f91BP1X46352 for ; Mon, 1 Oct 2001 07:25:02 -0400 Message-ID: <3BB85281.93CDD0D8@usa.net> Date: Mon, 01 Oct 2001 13:24:49 +0200 From: "Alberto di Bene" X-Mailer: Mozilla 4.75 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: LF: Re: 73KHz beacon References: <3.0.1.16.20011001084908.2af76e6c@mail.cc.kuleuven.ac.be> <3.0.1.16.20011001105044.2d67661a@mail.cc.kuleuven.ac.be> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Rik Strobbe wrote: > [...] > A short vertical monopole has a gain of 4.77dBi / 2.62dBd because of its > radiation pattern, especially the rather 'sharp' vertical pattern. > This gain of 4.77dBi assumes a perfect ground, so no losses at all. > [...] Rik, thanks for the explanations. I would have never imagined that the gain provided by having a radiation diagram 'squeezed' in the vertical plane could more than compensate for the losses caused by the very short dimensions (compared to the wavelength) of the antenna. Today I learnt a new one. TNX. 73 Alberto I2PHD