Return-Path: Received: (qmail 16680 invoked from network); 14 Aug 2001 19:26:06 -0000 Received: from unknown (HELO warrior-inbound.services.quay.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 14 Aug 2001 19:26:06 -0000 Received: (qmail 224 invoked from network); 14 Aug 2001 19:25:57 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 14 Aug 2001 19:25:57 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15Wjk2-0000jd-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 14 Aug 2001 20:20:42 +0100 Received: from cmailenv4.svr.pol.co.uk ([213.218.77.56]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15Wjjr-0000jY-00 for rsgb_lf_group@blacksheep.org; Tue, 14 Aug 2001 20:20:31 +0100 Received: from [62.21.133.206] (helo=w8k3f0) by cmailENV4.svr.pol.co.uk with smtp (Exim 3.22 #1) id 15WjjE-0003cU-00 for rsgb_lf_group@blacksheep.org; Tue, 14 Aug 2001 19:19:52 +0000 Message-ID: <000001c124f7$31973640$ce85153e@w8k3f0> From: "Dick Rollema" To: rsgb_lf_group@blacksheep.org References: <001e01c12497$f6364d20$0d9c153e@w8k3f0> <15WfE5-0EO2eeC@fwd05.sul.t-online.com> Subject: Re: LF: Radiated power at PA0SE Date: Tue, 14 Aug 2001 21:24:44 +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 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: Dear Uwe, Andy, G4JNT, already provided the answer in fundamental form. I use a simple rule that I can easily remember. At the small distance used for measuring field strength the ground constants do play a role and the field strength decreases in a linear way with distance. What I have to remember is that a radiated power of 1kW produces a FS of 300mV/m at 1km distance. That becomes 300/5.83 = 51.46mV/m at a distance of 5.83km where I made the measurement. The FS found was 0.370mV/m. So the radiated power was (0.370/51.46)^2 * 1000 watt = 0.0517W. 73, Dick, PA0SE JO22GD ----- Oorspronkelijk bericht ----- Van: jannsen <0482183881-0001@t-online.de> Aan: Verzonden: dinsdag 14 augustus 2001 16:31 Onderwerp: Re: LF: Radiated power at PA0SE > Dick Rollema schrieb: > > To All from PA0SE > > > ...................... > I found a FS of 370 > > microvolt/metre. From this follows an impressive radiated power (EIRP) of 52 > > milliwatt. > ............................. > > > > 73, Dick, PA0SE > > Dick, > you worked out / calculated that 370uV/m fieldstrength is 52mW EIRP (on 136kHz > I guess). what program did you use ? > regards > Uwe/dj8wx > > > >