Envelope-to: dave@picks.force9.co.uk Delivery-date: Wed, 01 Mar 2006 08:41:48 +0000 Received: by ptb-mxcore01.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1FEMu3-0006Yw-Rz for dave@picks.force9.co.uk; Wed, 01 Mar 2006 08:41:48 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (PlusNet MXCore v2.00) id 1FEMu3-0006Yj-M4 for dave@picks.force9.co.uk; Wed, 01 Mar 2006 08:41:47 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1FEMtk-00031i-B0 for rs_out_1@blacksheep.org; Wed, 01 Mar 2006 08:41:28 +0000 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FEMtj-00031Z-Rb for rsgb_lf_group@blacksheep.org; Wed, 01 Mar 2006 08:41:27 +0000 Received: from post-24.mail.nl.demon.net ([194.159.73.194]) by relay2.thorcom.net with esmtp (Exim 4.51) id 1FENp7-0003ts-FT for rsgb_lf_group@blacksheep.org; Wed, 01 Mar 2006 09:40:46 +0000 Received: from ndb.demon.nl ([82.161.81.65]:20108 helo=pcroelof) by post-24.mail.nl.demon.net with smtp (Exim 4.51) id 1FEMti-000P2l-0I for rsgb_lf_group@blacksheep.org; Wed, 01 Mar 2006 08:41:26 +0000 Message-ID: <000a01c63d0b$ec2f5f60$2201a8c0@pcroelof> From: "Roelof Bakker" To: rsgb_lf_group@blacksheep.org References: <440516F4.5000600@hifidelity.com> <010a01c63d05$cf3fe600$0300a8c0@LAPTOP> Date: Wed, 1 Mar 2006 09:41:23 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Subject: Re: LF: Common Mode Noise on Feedline... Content-Type: text/plain; charset=Windows-1252; format=flowed Content-Transfer-Encoding: 8bit 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-PN-SpamFiltered: by PlusNet MXCore (v2.00) Hello Peter, I have been experimenting with an isolating transformer in the past. It was mounted in a plastic enclosure and stray capacitance was kept to a minimum. It did not work properly. An other disadvantage is that for a practical transformer VLF performance is suffering quite a bit. I have measured the source of the noise, using a battery powered SLM. It appeared that the noise was picked up on the shield of the coax running inside the house. Connecting the shield to a good radio earth before entering the house, solved my noise problem. Best regards, Roelof Bakker, pa0rdt