Return-Path: <majordom@post.thorcom.com>
Received: (qmail 4385 invoked from network); 30 Oct 1999 16:57:13 +0100
Received: from unknown (HELO magnet.force9.net) (195.166.128.26) by guiness.force9.net with SMTP; 30 Oct 1999 16:57:13 +0100
Received: (qmail 12135 invoked from network); 30 Oct 1999 16:05:37 -0000
Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnet.plus.net.uk with SMTP; 30 Oct 1999 16:05:37 -0000
Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 11halG-0004wn-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 30 Oct 1999 16:49:46 +0100
Received: from [143.179.236.31] (helo=Iguanodon.big-orange.net) by post.thorcom.com with esmtp (Exim 3.02 #1) id 11halF-0004wi-00 for rsgb_lf_group@blacksheep.org; Sat, 30 Oct 1999 16:49:45 +0100
Received: from w8k3f0 ([143.179.151.202]) by Iguanodon.big-orange.net         (Netscape Messaging Server 3.6)  with SMTP id AAB7F4         for <rsgb_lf_group@blacksheep.org>;         Sat, 30 Oct 1999 11:45:34 +0200
Message-ID: <001d01bf22bb$7bd8d5a0$ca97b38f@w8k3f0>
From: "Dick Rollema" <d.w.rollema@gironet.nl>
To: rsgb_lf_group@blacksheep.org
Subject: LF: Re: groundwave questions
Date: Sat, 30 Oct 1999 11:44:21 +0200
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 4.72.3110.5
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: <majordom@post.thorcom.com>

Hello Gamal,

My antnna modelling program AO has the possibility to compute the total
field in X, Y and Z coordinates but only to a maximum of 10 km from the
transmitter. Over such a short distance the ground constants have hardly any
effect so I don't think it would be of use to you.

73, Dick, PA0SE

Gamal wrote:



>Hello all
>
>I have some questions on
>how electric and magnetic field lines are aligned,
>how fieldstrength will vary with distance from source
>in the following four academic cases.
>
>
>
>Constrains which are common for all cases:
>
>* No ionosphere present.
>* earth constitutes a level plain of matter with
>electric parameters as specified.
>* A vertically polarized electromagnetic field emanates from
>an otherwise unspecified source.
>* The fieldstrength when measured on ground is 1 V/m
>at a distance of 1 km from the source.
>
>
>
>(case 1)
>assume earth conductivity is infinity,
>rel. permeability equals ONE,
>rel. permitivity equals ONE
>
>(case 2)
>assume earth conductivity is ZERO,
>rel. permeability equals ONE,
>rel. permitivity equals ONE
>
>(case 3)
>assume earth conductivity is ZERO,
>rel. permeability equals ONE,
>rel. permitivity equals 80 (eight zero).
>
>(case 4)
>assume earth conductivity is ONE mhos/meter,
>rel. permeability equals ONE,
>rel. permitivity equals ONE.
>
>best 73 de Gamal
>
>
>