Return-Path: Received: from rly-me02.mx.aol.com (rly-me02.mail.aol.com [172.20.83.35]) by air-me04.mail.aol.com (v124.15) with ESMTP id MAILINME041-99d4a8b1972396; Tue, 18 Aug 2009 17:13:32 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-me02.mx.aol.com (v124.15) with ESMTP id MAILRELAYINME021-99d4a8b1972396; Tue, 18 Aug 2009 17:13:24 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MdVys-0003qK-5d for rs_out_1@blacksheep.org; Tue, 18 Aug 2009 22:12:34 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MdVyr-0003qB-LB for rsgb_lf_group@blacksheep.org; Tue, 18 Aug 2009 22:12:33 +0100 Received: from smtp809.mail.ird.yahoo.com ([217.146.188.69]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1MdVyl-0004GJ-80 for rsgb_lf_group@blacksheep.org; Tue, 18 Aug 2009 22:12:29 +0100 Received: (qmail 88520 invoked from network); 18 Aug 2009 21:12:21 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=v/97B42ysf6X7ShlqvsgH8FiOzGFXOtsOWGdSphXflXeAEKmDgO16Ba7qA1Pt8b5DU62U7klLuIclSr3vCG/OJAlDI/92ZvxfrrZLU3iLoqbMDhEPRAHDRBMF1vvdakOvTAiZTO5nOvCd0pZ8NWiPuCc1iFw96nxUC9PFfyILJU= ; Received: from unknown (HELO JimPC) (james.moritz@86.178.42.85 with login) by smtp809.mail.ird.yahoo.com with SMTP; 18 Aug 2009 21:12:21 -0000 X-Yahoo-SMTP: qKIhhNCswBB2TTHr2BORWcGGR2mpopxhCcunGIxpCKQYiG07Q7UOhNo- X-YMail-OSG: wSO29MkVM1lO5WFLDtaZptRnsm2w.UhXyYCKMkK4pDvioOAQ9QU8kRC1ZxerowhA1g9hiLz9eC_7IJR1Vo9_VlkEBeq23O_mlgLbV.9E5N7xJG5t6E7a1XeQCVM84yJwz8gATyZrkRBpTC9gS3CwnrJ4x0kCBThixVzzwUk66ztNoq.U8LI3t0AUNLX1mWp1WlAmJrnE8h6s2ZKKjTek9UP0jLAEKAeb.aERLW5EsPxD23z1WFiFry9dFU10QTYaKwwyZIrUFSKnEyjUNn1p3k.bMix9gVYSILrcyVXxpXgY9bd5vg-- X-Yahoo-Newman-Property: ymail-3 Message-ID: From: "James Moritz" To: References: <20090818201756.306460@gmx.net> In-Reply-To: <20090818201756.306460@gmx.net> Date: Tue, 18 Aug 2009 22:12:20 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18000 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: 500kHz qrg range Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original 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=0.1 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-IP: 193.82.116.20 Dear Dennis, LF Group, > So I ask myself and now You :) , would You say it's important to keep the > full rx range from 495kHz to 510kHz and >pay the price of a worse stopband > attenuation, or do You think, it's unlikely to hear any transmission at > the band corners? Certainly some of the US stations were operating beacons above 507kHz last winter, so I would make the upper cut-off frequency 510k or above - it would very frustrating if you could not receive signals because your own preselector rejected them! If you need better stopband rejection, you could add an extra resonator to the filter. Cheers, Jim Moritz 73 de M0BMU