Return-Path: Received: (qmail 8898 invoked from network); 24 Jun 1999 15:47:48 +0100 Received: from magnet.plus.net.uk (HELO magnet.force9.net) (195.166.128.26) by guiness.force9.net with SMTP; 24 Jun 1999 15:47:48 +0100 Received: (qmail 7677 invoked from network); 24 Jun 1999 14:47:57 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnet.plus.net.uk with SMTP; 24 Jun 1999 14:47:57 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 10xAMp-0008Dh-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 24 Jun 1999 15:20:39 +0100 X-Priority: 3 Received: from mserv1a.u-net.net ([195.102.240.34]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 10xAMn-0008Dc-00 for rsgb_lf_group@blacksheep.org; Thu, 24 Jun 1999 15:20:37 +0100 X-MSMail-Priority: Normal Received: from rsgb.u-net.com ([195.102.80.225] helo=rsgb.org.uk) by mserv1a.u-net.net with smtp (Exim 2.10 #61) id 10xAN4-0007BG-00 for rsgb_lf_group@blacksheep.org; Thu, 24 Jun 1999 15:20:55 +0100 Received: from miked.rsgbhq [192.168.2.30] by rsgb.org.uk [192.168.2.132] with SMTP (MDaemon.v2.7.SP3.R) for ; Thu, 24 Jun 1999 15:17:48 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 From: "Mike Dennison" Organization: Radio Society of Great Britain To: rsgb_lf_group@blacksheep.org Date: Thu, 24 Jun 1999 15:19:22 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 8bit Subject: LF: More on Rr X-Mailer: Pegasus Mail for Win32 (v3.01d) X-MDaemon-Deliver-To: rsgb_lf_group@blacksheep.org Message-ID: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Sender: Further to my note on Radiation Resistance formulas, the highly respected 160m expert ON4UN uses 1450 instead of "160 (or 60) multiplied by pi squared" in his excellent book Low Band DXing. This figure is lower than 160 x pi sq (1580) but nowhere near as low as 60 x pi sq (592). I assume that he must have done some practical measurements which gave him a better figure than that calculated in the 1920s. My first reaction is that (shock, horror) Terman and many others are wrong and the Admiralty was almost right. And my ERP is definitely (probably, perhaps) 44mW. Mike