X-GM-THRID: 1235384865678835942 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.35.12.7 with SMTP id p7cs31428pyi; Wed, 2 May 2007 18:13:38 -0700 (PDT) Received: by 10.67.98.4 with SMTP id a4mr1530996ugm.1178154817693; Wed, 02 May 2007 18:13:37 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id 24si2316648ugf.2007.05.02.18.13.35; Wed, 02 May 2007 18:13:37 -0700 (PDT) Received-SPF: neutral (google.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 1HjPo9-0002Xk-MK for rs_out_1@blacksheep.org; Thu, 03 May 2007 02:08:33 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1HjPo9-0002Xb-2V for rsgb_lf_group@blacksheep.org; Thu, 03 May 2007 02:08:33 +0100 Received: from fish2.hurontel.on.ca ([216.46.129.163]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1HjPo8-0004w9-70 for rsgb_lf_group@blacksheep.org; Thu, 03 May 2007 02:08:33 +0100 Received: from server (dial-164.hurontel.on.ca [216.46.128.164]) by fish2.hurontel.on.ca (Spam Firewall) with SMTP id 839543173AB for ; Wed, 2 May 2007 21:08:24 -0400 (EDT) Message-ID: <006a01c78d17$440b3d60$0b01a8c0@server> From: "J. B. Weazle McCreath" To: References: <004d01c78c3a$48757ec0$0b01a8c0@server> <003501c78c4d$0d68f060$0300a8c0@lark> Date: Thu, 3 May 2007 01:08:45 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: Re: Passive high-pass filter circuits? Content-Type: text/plain; charset="iso-8859-1" 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: 1739 Hi Alan, If the roll off was such that the strength was around 6 dB down at 250 Hz. it would satisfy my requirements. What I'm after is reducing mains hum and its first few harmonics to a level where they are below the strength of the desired signals, which fall in the range of 1 to 4.5 kHz. 73, J.B., VE3EAR - VE3WZL Solar and wind powered Lowfer " EAR" 188.830 EN93dr http://www.hurontel.on.ca/~weazle