Return-Path: Received: (qmail 25708 invoked from network); 12 May 2001 20:19:13 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 12 May 2001 20:19:13 -0000 Received: (qmail 6964 invoked from network); 12 May 2001 20:18:40 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 12 May 2001 20:18:40 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14yfhq-0004Ws-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 12 May 2001 21:09:38 +0100 Received: from smtp-1.visp.telinco.net ([212.1.130.1]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14yfhp-0004Wn-00 for rsgb_lf_group@blacksheep.org; Sat, 12 May 2001 21:09:37 +0100 Received: from [212.1.156.192] (helo=g4jnt) by smtp-1.visp.telinco.net with smtp (Exim 3.22 #1) id 14yfaT-0002Ak-00 for rsgb_lf_group@blacksheep.org; Sat, 12 May 2001 21:02:01 +0100 Message-ID: <000e01c0db1f$11486480$c09c01d4@g4jnt> From: "Andrew Talbot" To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Measurement of antenna current Correction Date: Sat, 12 May 2001 21:06:07 +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 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: >I measured the thinkness of some (Sainsbury's own brand) foil at 0.03mm. >This equates to 0.13 skin depths. It is even worse. I read the micrometer wrong, a very ancient one calibrated in those US units of 25.4mm called inches, (cost nothing so I live with it) The kitchen foil is 0.02mm thickness, so 0.09 skin depths Current penetration EXP(-0.09) = 0.91 so only 9 percent screening at 137kHz Andy 'JNT