Return-Path: Received: (qmail 5883 invoked from network); 24 Apr 1999 16:06:19 +0100 Received: from magnet.plus.net.uk (HELO magnet.force9.net) (195.166.128.26) by guiness.force9.net with SMTP; 24 Apr 1999 16:06:19 +0100 Received: (qmail 25036 invoked from network); 24 Apr 1999 15:06:36 -0000 Received: from post.thorcom.com (194.75.130.70) by magnet.plus.net.uk with SMTP; 24 Apr 1999 15:06:36 -0000 Received: from troy.blacksheep.org ([194.75.183.50] ident=root) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10b3z7-0000Dm-00; Sat, 24 Apr 1999 16:04:49 +0100 Received: (from root@localhost) by troy.blacksheep.org (8.6.12/8.6.12) id PAA26246 for rsgb_lf_group-outgoing; Sat, 24 Apr 1999 15:03:51 GMT Received: from post.thorcom.com (root@post.unica.co.uk [194.75.183.70]) by troy.blacksheep.org (8.6.12/8.6.12) with ESMTP id PAA26242 for ; Sat, 24 Apr 1999 15:03:49 GMT Received: from mashie.force9.net ([195.166.128.30]) by post.thorcom.com with smtp (Exim 2.04 #3) id 10b3xj-0000Db-00 for rsgb_lf_group@blacksheep.org; Sat, 24 Apr 1999 16:03:23 +0100 Received: (qmail 4741 invoked from network); 24 Apr 1999 15:03:53 -0000 Received: from relay3.force9.net (HELO relay2.force9.net) (195.166.128.25) by mashie.force9.net with SMTP; 24 Apr 1999 15:03:53 -0000 Received: (qmail 20977 invoked from network); 24 Apr 1999 14:58:20 -0000 Received: from 27.hiper02.shef.dialup.force9.net (HELO prstesv1) (195.166.144.27) by relay3.force9.net with SMTP; 24 Apr 1999 14:58:20 -0000 Message-ID: <001601be8e63$e22785a0$0600a8c0@prstesv1.prestel.co.uk> From: "Dave" To: "LF Group" Subject: LF: Re: Further signals measured (2nd version) Date: Sat, 24 Apr 1999 16:05:23 +0100 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 4.72.3110.1 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Geri etc. It could be true, Graham's aerial is higher than mine but his top loading comes down inverted V fashion which drastically lowers the average height. The RF power is about the same. By the calculations, the best erp I could be radiating is 1W but my house is under the aerial so it will be less. Probably the most significant difference is that Graham is on the West of London and his signal is launched across the city skyline in your direction whereas my take-off to the South East is good. So even if the calculated erp of two stations is the same we have to consider the surrounding terrain? 73, Dave G3YXM >G3XTZ, distance to my qth 732 km: -121 dBm(75 Ohm) >G3YXM, distance to my qth 826 km: -119 dBm (75 Ohm). > >So, G3YXM, despite the fact that he is further away, has a signal that is 2 >dB stonger than G3XTZ. > >BTW: I found the source of the CCIR curves (you have to pay 35.- CH-Francs >to download them). According to a curve for medium dry ground (is the UK >soil medium dry?) the difference in field strength between 826 and 732 km >is around 3 dB, this would mean that G3YXM has an ERP that is 5 dB more >than G3XTZ. True or not? > >Vy 73 > >Geri, DK8KW (W1KW)