Return-Path: Received: from rly-mg06.mx.aol.com (rly-mg06.mail.aol.com [172.20.83.112]) by air-mg05.mail.aol.com (v123.4) with ESMTP id MAILINMG052-a1b4a139c9275; Wed, 20 May 2009 02:01:05 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mg06.mx.aol.com (v123.4) with ESMTP id MAILRELAYINMG065-a1b4a139c9275; Wed, 20 May 2009 02:00:52 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1M6ept-0008Bh-7u for rs_out_1@blacksheep.org; Wed, 20 May 2009 06:59:29 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1M6eps-0008BY-PV for rsgb_lf_group@blacksheep.org; Wed, 20 May 2009 06:59:28 +0100 Received: from c2beaomr08.btconnect.com ([213.123.26.186]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1M6epq-0006xT-29 for rsgb_lf_group@blacksheep.org; Wed, 20 May 2009 06:59:28 +0100 Received: from [192.168.1.64] (host86-158-34-40.range86-158.btcentralplus.com [86.158.34.40]) by c2beaomr08.btconnect.com (MOS 3.8.6-GA) with ESMTP id CMX17874; Wed, 20 May 2009 06:59:20 +0100 (BST) Message-ID: <4A139C39.7070609@btconnect.com> Date: Wed, 20 May 2009 06:59:21 +0100 From: Richard Newstead User-Agent: Thunderbird 2.0.0.21 (Windows/20090302) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <003001c9d8c4$719e7710$6401a8c0@asus> <20090519232905.l4n0cl7o5vk0oogs@webmail4.kuleuven.be> In-Reply-To: X-Junkmail-Status: score=10/50, host=c2beaomr08.btconnect.com X-Junkmail-SD-Raw: score=unknown, refid=str=0001.0A0B0208.4A139C39.0055,ss=1,fgs=0, ip=192.168.1.64, so=2007-10-30 19:00:17, dmn=5.7.1/2008-09-02 X-Junkmail-IWF: false X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: 518khz - Notch Filter. Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Andy Talbot wrote: > Ansoft Designer came up with this solution. > > http://www.g4jnt.com/518kHz_BandStop.gif > > The component values aren't particulalrly nice, and there is almost > certainly a nicer design with transformers to be found, but... > Andy Is that modelled with "real" components or lossless ones? How would it be likely to perform over a typical shack temperature range? 73 Richard G3CWI > > > > > > > > -- SOTA Beams Quality products for Radio Amateurs http://www.sotabeams.co.uk Tel: 01625-425700