X-GM-THRID: 1212399928982230101 X-Gmail-Labels: rsgb lf X-Gmail-Received: 01d66d3cdca9da60cbf5e588f85b3ef31fed8803 Delivered-To: daveyxm@gmail.com Received: by 10.64.249.16 with SMTP id w16cs245032qbh; Tue, 22 Aug 2006 09:08:05 -0700 (PDT) Received: by 10.49.91.6 with SMTP id t6mr640410nfl; Tue, 22 Aug 2006 09:08:05 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id q28si726290nfc.2006.08.22.09.08.04; Tue, 22 Aug 2006 09:08:05 -0700 (PDT) Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1GFYhG-0007VU-3s for rs_out_1@blacksheep.org; Tue, 22 Aug 2006 17:01:46 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1GFYhF-0007VL-Oo for rsgb_lf_group@blacksheep.org; Tue, 22 Aug 2006 17:01:45 +0100 Received: from post-23.mail.nl.demon.net ([194.159.73.193]) by relay1.thorcom.net with esmtp (Exim 4.62) (envelope-from ) id 1GFYhC-0004Gc-1P for rsgb_lf_group@blacksheep.org; Tue, 22 Aug 2006 17:01:45 +0100 Received: from ndb.demon.nl ([82.161.81.65]:13117 helo=pcroelof) by post-23.mail.nl.demon.net with smtp (Exim 4.51) id 1GFYhB-0004cr-Bj for rsgb_lf_group@blacksheep.org; Tue, 22 Aug 2006 16:01:41 +0000 Message-ID: <004401c6c604$3bc59090$2101a8c0@pcroelof> From: "Roelof Bakker" To: References: Date: Tue, 22 Aug 2006 18:01:30 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 X-Spam-Score: -0.9 (/) X-Spam-Report: autolearn=disabled,AWL=-0.922 Subject: LF: Re: These sliding doors again Content-Type: text/plain; format=flowed; charset="Windows-1252"; 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 Status: O X-Status: X-Keywords: X-UID: 5364 Hello Laurence, Thank you for sending this information to the list. Your 30 - 40 db noise attenuation agrees very well with my own findings at 400 kHz: 40 dB for a concrete building and 32 dB for a brick wall house. The clue is the walls attenuating the noise from inside the building. Thus at LF all is not lost for the city dweller using an E-field probe! You are the first one who carried out the same research as I did (as far as I know of) and I am very pleased to have the results reproduced under such difficult circumstances. It might be quite educational to try a loop at the same location. Thank you for your efforts. Best regards, Roelof Bakker, pa0rdt