Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 77CF238000134; Thu, 13 Sep 2012 07:16:00 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TC7Lr-0002vb-44 for rs_out_1@blacksheep.org; Thu, 13 Sep 2012 12:12:55 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TC7Lq-0002vS-Hu for rsgb_lf_group@blacksheep.org; Thu, 13 Sep 2012 12:12:54 +0100 Received: from mailout-de.gmx.net ([213.165.64.22]) by relay1.thorcom.net with smtp (Exim 4.77) (envelope-from ) id 1TC7Ln-0007FD-UH for rsgb_lf_group@blacksheep.org; Thu, 13 Sep 2012 12:12:53 +0100 Received: (qmail invoked by alias); 13 Sep 2012 11:12:50 -0000 Received: from p54B9B742.dip.t-dialin.net (EHLO Notebook) [84.185.183.66] by mail.gmx.net (mp032) with SMTP; 13 Sep 2012 13:12:50 +0200 X-Authenticated: #20371661 X-Provags-ID: V01U2FsdGVkX1+BYzUOuWiBE+Gn4jKZG08wUCbFh7g+tVaQTVwSd7 Fv/g8KMGuflulj Message-ID: <62B8952382DF4DB294DF41CA351C4188@Notebook> From: "Thomas Rosenkranz" To: References: <5050EA23.1040802@iup.uni-heidelberg.de> In-Reply-To: Date: Thu, 13 Sep 2012 13:12:45 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18416 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18645 X-Y-GMX-Trusted: 0 X-Spam-Score: 0.5 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hy Ken, the name of the mechanical filter is FZ02 http://www.oppermann-electronic.de/html/hf-spezialbauteile.html http://dm4tr.bplaced.net/index.php?section=Receiver [...] Content analysis details: (0.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [213.165.64.22 listed in list.dnswl.org] 0.2 STOX_REPLY_TYPE STOX_REPLY_TYPE 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (thomas.rosenkranz.1[at]gmx.de) -0.0 SPF_PASS SPF: sender matches SPF record 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (thomas.rosenkranz.1[at]gmx.de) X-Scan-Signature: 0317e2ac8ed27149e57223a21580246d Subject: LF: Re: RE: MF tonite Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-global-disposition: G x-aol-sid: 3039ac1db4095051c06f43ea X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hy Ken, the name of the mechanical filter is FZ02 http://www.oppermann-electronic.de/html/hf-spezialbauteile.html http://dm4tr.bplaced.net/index.php?section=Receiver 73 Thomas DM4TR ----- Original Message ----- From: "Ken" To: Sent: Thursday, September 13, 2012 10:28 AM Subject: LF: RE: MF tonite Hi Stefan. What mechanical filter are you using?. 73. Ken M0KHW -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Stefan Schäfer Sent: 12 September 2012 21:02 To: rsgb_lf_group@blacksheep.org Subject: LF: MF tonite Christian, Are you QRV tonite? I would like to see or better hear the difference of my RX performance when using my band filter i was testing in the afternoon. It is the mechanical filter which uses source followers at the input and output, to provide a constant accurate impedance matching to keep the passband ripple as low as possible. The afternoons tests have been very promising, see https://dl.dropbox.com/u/19882028/MF/MF%20Filter.png This is the frequency response: https://dl.dropbox.com/u/19882028/MF/473%20kHz%20ZF%20Filter%2040%20dB.png There should be a much better image rejection now and so maybe a few more dB SNR... Unfortunately the filter does not cover the 502 kHz region. But this problem will be gone in some months... Will be on 472.5 kHz soon. 73, Stefan/DK7FC Am 12.09.2012 21:01, schrieb C. Groeger: > Thanks, mal for these wise words! > Df5qg (Homebrew& CW) > > Christian Groeger > > mal hamilton schrieb: > > >> Never replace the MORSE KEY, you do at your peril !! >> Other modes come and go but MORSE lives on >> All Radio Operators know this. >> >> G3KEV >> >>