Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t4KDB9M2028660 for ; Wed, 20 May 2015 15:11:09 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Yv3jH-0008OQ-VP for rs_out_1@blacksheep.org; Wed, 20 May 2015 14:08:11 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Yv3jH-0008OH-N9 for rsgb_lf_group@blacksheep.org; Wed, 20 May 2015 14:08:11 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85) (envelope-from ) id 1Yv3jF-0004TU-9x for rsgb_lf_group@blacksheep.org; Wed, 20 May 2015 14:08:10 +0100 Received: from crusoe.iup.uni-heidelberg.de (crusoe.iup.uni-heidelberg.de [129.206.22.248]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id t4KD8869020599 for ; Wed, 20 May 2015 15:08:08 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by crusoe.iup.uni-heidelberg.de (Postfix) with ESMTP id 4A776E1B5E for ; Wed, 20 May 2015 15:08:08 +0200 (CEST) Message-ID: <555C8738.8050209@posteo.de> Date: Wed, 20 May 2015 15:08:08 +0200 From: DK7FC 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: <555BAAF1.4020800@posteo.de> <555C55B7.22322.27DD83@roelof.ndb.demon.nl> In-Reply-To: <555C55B7.22322.27DD83@roelof.ndb.demon.nl> X-Scan-Signature: bb61bee384896e075004ae5ec954ddd2 Subject: Re: LF: FZ-02-B mechanical filter input matching Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 3172 Hi Roelof, My goal is to cut out the spectrum of interest before passing it to the mixer. This meachanical filter is doing the job very well. It has an excellent stop band attenuation, a low pass band ripple, it is cheap, it is available, it doesn't need much fine tuning, it is mechanically stable and compact. I may find a few more arguments when thinking longer :-) 73, Stefan PS: Thanks Rik for the feedback. Am 20.05.2015 11:36, schrieb roelof@ndb.demon.nl: > Hello Stefan, > > I wonder why you are using a mechanical filter for this purpose. > Using a four pole (top coupled) LC filter provides the possibility > for matching at both sides of the filter and full coverage of the > 630m band. > > 73, > roelof, pa0rdt > >