Return-Path: Received: (qmail 4842 invoked from network); 14 Jul 2001 22:24:44 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 14 Jul 2001 22:24:44 -0000 Received: (qmail 12855 invoked from network); 14 Jul 2001 22:23:22 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 14 Jul 2001 22:23:22 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15LXjy-00024e-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 14 Jul 2001 23:18:22 +0100 Received: from smtp-1.visp.telinco.net ([212.1.130.1]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15LXjw-00024Z-00 for rsgb_lf_group@blacksheep.org; Sat, 14 Jul 2001 23:18:21 +0100 Received: from [212.1.136.130] (helo=g4jnt) by smtp-1.visp.telinco.net with smtp (Exim 3.22 #1) id 15LXWT-0008KW-00 for rsgb_lf_group@blacksheep.org; Sat, 14 Jul 2001 23:04:25 +0100 Message-ID: <004501c10cb2$a8fab840$828801d4@g4jnt> From: "Andrew Talbot" To: "LF Group" Subject: LF: Re: Near field of 9kHz antenna IV Date: Sat, 14 Jul 2001 23:03:59 +0100 MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 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 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit

Wait a minute !

I = SQR(W / R) so current in the loop = 51.2A and voltage at the feed is this current in the 60 ohms reactance, ie. 3077V

Andy G4JNT

-----Original Message-----
From: Dick Rollema <d.w.rollema@freeler.nl>

To All from PA0SE

AO gives the feed point impedance as Z = 0.380 + j60.1 ohm and the efficiency as 0.03%.

So for 1 kW fed into the loop the current must be SQR(0.380 * 1000) = 19.5A.

The voltage at the feed point becomes 19.5 * 0.380 = 1172V.