Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-db02.r1000.mx.aol.com (Internet Inbound) with ESMTP id ABDDF380000AE; Wed, 12 Sep 2012 16:06:27 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TBtBC-0008VB-OP for rs_out_1@blacksheep.org; Wed, 12 Sep 2012 21:04:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TBtBC-0008V2-39 for rsgb_lf_group@blacksheep.org; Wed, 12 Sep 2012 21:04:58 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1TBtBA-0004XM-CO for rsgb_lf_group@blacksheep.org; Wed, 12 Sep 2012 21:04:56 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id q8CK4t6s010399 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 12 Sep 2012 22:04:55 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q8CK4tnN005880 for ; Wed, 12 Sep 2012 22:04:55 +0200 Message-ID: <5050EA23.1040802@iup.uni-heidelberg.de> Date: Wed, 12 Sep 2012 22:01:39 +0200 From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Spam-Score: -2.7 (--) 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: 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 [...] Content analysis details: (-2.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [129.206.210.211 listed in list.dnswl.org] -0.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 Subject: LF: MF tonite Content-Type: text/plain; charset=UTF-8; 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-global-disposition: G x-aol-sid: 3039ac1d40565050eb423b86 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none 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 >> >>