Envelope-to: dave@picks.force9.co.uk Delivery-date: Thu, 03 Nov 2005 16:23:35 +0000 Received: by pih-mxcore07.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1EXhsD-0001xX-Hw for dave@picks.force9.co.uk; Thu, 03 Nov 2005 16:23:34 +0000 Received: from post.thorcom.com ([193.82.116.20]) by pih-mxcore07.plus.net with esmtp (PlusNet MXCore v2.00) id 1EXhsD-0001v7-CR for dave@picks.force9.co.uk; Thu, 03 Nov 2005 16:23:33 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1EXhrx-0008HH-HC for rs_out_1@blacksheep.org; Thu, 03 Nov 2005 16:23:17 +0000 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1EXhrx-0008H8-1v for rsgb_lf_group@blacksheep.org; Thu, 03 Nov 2005 16:23:17 +0000 Received: from mailout06.sul.t-online.com ([194.25.134.19]) by relay2.thorcom.net with esmtp (Exim 4.51) id 1EXivl-0005ri-My for rsgb_lf_group@blacksheep.org; Thu, 03 Nov 2005 17:31:20 +0000 Received: from fwd26.aul.t-online.de by mailout06.sul.t-online.com with smtp id 1EXhqt-0005UN-03; Thu, 03 Nov 2005 17:22:11 +0100 Received: from dl4eau (VO7v0-ZEwenmvacOQnLeWSeX+GY05O0ao0kWeSbIYut5DyB+Y00Z8J@[217.245.119.132]) by fwd26.sul.t-online.de with smtp id 1EXhqq-0xWoQy0; Thu, 3 Nov 2005 17:22:08 +0100 From: "Thomas Eckart" To: rsgb_lf_group@blacksheep.org Date: Thu, 3 Nov 2005 17:21:52 +0100 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: <000901c5e005$e2d511c0$fe79a8c0@PCVONWALTER> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-ID: VO7v0-ZEwenmvacOQnLeWSeX+GY05O0ao0kWeSbIYut5DyB+Y00Z8J X-TOI-MSGID: d30153eb-46c1-41b1-a69b-9ddf01a4ec13 Subject: LF: low pass filter for power use Content-Type: text/html; charset=windows-1252 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) Content-transfer-encoding: 8bit

Hi Lf's
in all circuit diagrams I find filters like 12nF---->54uH---->27nF----->54uH----->12nF
here is the 3db point at 250khz.
Has anyone test a filter in this configuration 47nF-----> 54uH----->82nF------54uH----->47nF
here is the 3db point at 147khz.
The 2. filter gives a better suppress of the harmonics!
Wat is the reason that all use the fist one?

best 73' Tom DL4EAU