Return-Path: Received: (qmail 13202 invoked from network); 17 Jan 2003 09:51:07 -0000 Received: from netmail02.services.quay.plus.net (212.159.14.221) by mailstore with SMTP; 17 Jan 2003 09:51:07 -0000 Received: (qmail 25998 invoked from network); 17 Jan 2003 09:50:28 -0000 Received: from post.thorcom.com (193.82.116.70) by netmail02.services.quay.plus.net with SMTP; 17 Jan 2003 09:50:28 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.12) id 18ZT4a-0007aE-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 17 Jan 2003 09:46:00 +0000 Received: from [194.73.73.93] (helo=rhenium.btinternet.com) by post.thorcom.com with esmtp (Exim 4.12) id 18ZT4a-0007a5-00 for rsgb_lf_group@blacksheep.org; Fri, 17 Jan 2003 09:46:00 +0000 Received: from host62-6-88-81.in-addr.btopenworld.com ([62.6.88.81] helo=Main) by rhenium.btinternet.com with smtp (Exim 3.22 #16) id 18ZT4Z-0006Yp-00 for rsgb_lf_group@blacksheep.org; Fri, 17 Jan 2003 09:45:59 +0000 Message-ID: <000701c2be0d$16426ee0$6507a8c0@Main> From: "Alan Melia" To: "LF-Group" Date: Fri, 17 Jan 2003 09:44:46 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Notch for DCF39 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=1.0 required=6.0tests=SPAM_PHRASE_00_01,USER_AGENT_OEversion=2.43 X-Spam-Level: * X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hi all, a belated Chrismas present to the Group. As a result of a discussion with Hugh M0WYE, I calculated, and simulated a Bridged-T Notch Filter for 136kHz, which should reduce the level of DCF39 by about 30dB which only giving about 2 or 3 dB loss at the top of the band. Hugh has made up the filter and from workbench tests it seems promising. It occurs to me that this may be of interest to those living closer to Burg that we do. Details on http://www.alan.melia.btinternet.co.uk/BR-t-Notch.htm We would be interested if anyone finds it useful. Cheers de Alan G3NYK alan.melia@btinternet.com http://www.alan.melia.btinternet.co.uk