Return-Path: Received: from rly-mc04.mail.aol.com (rly-mc04.mail.aol.com [172.20.118.146]) by air-mc01.mail.aol.com (v121.4) with ESMTP id MAILINMC13-11d47c1ee88213; Sun, 24 Feb 2008 17:24:16 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mc04.mail.aol.com (v121.4) with ESMTP id MAILRELAYINMC45-11d47c1ee88213; Sun, 24 Feb 2008 17:24:10 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JTPFA-0007uV-Gk for rs_out_1@blacksheep.org; Sun, 24 Feb 2008 22:22:48 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JTPF9-0007uM-Tz for rsgb_lf_group@blacksheep.org; Sun, 24 Feb 2008 22:22:47 +0000 Received: from smtp5.freeserve.com ([193.252.22.159]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JTPF2-0004uN-Kw for rsgb_lf_group@blacksheep.org; Sun, 24 Feb 2008 22:22:47 +0000 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3429.me.freeserve.com (SMTP Server) with ESMTP id E99661C00087 for ; Sun, 24 Feb 2008 23:22:10 +0100 (CET) Received: from AGB (unknown [91.109.14.153]) by mwinf3429.me.freeserve.com (SMTP Server) with SMTP id AFAD81C00082 for ; Sun, 24 Feb 2008 23:22:08 +0100 (CET) X-ME-UUID: 20080224222208719.AFAD81C00082@mwinf3429.me.freeserve.com Message-ID: <000d01c87733$b243e2d0$0e00000a@AGB> From: "Graham" To: References: <021420082154.26694.47B4B8AF000ED3D10000684622155863949C9D01CD05@comcast.net> <000b01c86f6d$8dbf6bf0$0d00000a@AGB> <01d301c86fba$5d7f4080$0301a8c0@g3kev> <000d01c86fd3$b60ac1c0$412d7ad5@w4o8m9> <00be01c8701c$5a2616e0$0d00000a@AGB> <006901c87029$d20dd0f0$0301a8c0@g3kev> Date: Sun, 24 Feb 2008 22:22:06 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: Re: Re: Re: NOV UPDATE Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : n > Graham. > With that small antenna you might be lucky if it is 0.1% efficient, > therefore to get 1w erp you need 1Kw less 2.6db ie 555 watts to the > antenna > feed point. > If you are using a linear pa at 50% eff you would need a DC input of 1.110 > Kwatts or a class D at 70% eff 793 watts. > This is a rough estimate, other factors need consideration as explained > before. > You probably know all about the subject anyway. > To measure the far field properly an airborne platform is necessary to get > a > clear run and avoid obstructions like buildings and trees etc. This is the > procedure used professionally. If you have a friend in the RAF this might > help > > mal/g3kev > > ____________________________________________________________ I was typing 'fields' into google and can across this , nicely framed by the boys from Liverpool http://uk.youtube.com/watch?v=Ywg-PdeGVL0 'A friend in the RAF' , Guess that's a new take on 'Aerial' measurements, http://uk.youtube.com/watch?v=rJX03LcmNpU 1.1 Kw dc input may be be 'pushing' things a little too far hihi G ..