Return-Path: Received: from rly-mf04.mx.aol.com (rly-mf04.mail.aol.com [172.20.29.174]) by air-mf04.mail.aol.com (v121_r4.4) with ESMTP id MAILINMF043-959495163d9385; Tue, 23 Dec 2008 17:19:12 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mf04.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINMF047-959495163d9385; Tue, 23 Dec 2008 17:19:06 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LFFaG-0000u1-H1 for rs_out_1@blacksheep.org; Tue, 23 Dec 2008 22:18:36 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LFFaF-0000ts-UK for rsgb_lf_group@blacksheep.org; Tue, 23 Dec 2008 22:18:35 +0000 Received: from web63603.mail.re1.yahoo.com ([69.147.97.73]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1LFFaE-0004w9-7T for rsgb_lf_group@blacksheep.org; Tue, 23 Dec 2008 22:18:35 +0000 Received: (qmail 13929 invoked by uid 60001); 23 Dec 2008 22:18:27 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type:Message-ID; b=oqmivO+JSITFIPHGpyqlACs8VnWwzHExgkaDs92LWKh1NRzLF9bi/Ixwktv7QkoWsT/eijQBT90ptWzZnYi6ggsJyRemikojLSSmFcZefdh1gP9kT2baGOfiCDZk+wMRRkBOzomBDkAiZJaKkoGOWCosfMaqcjbFgys8MqNxUeY=; X-YMail-OSG: z4RStWgVM1mF2_NGiqoFEyQt.CDFK9Xlzf377wTlQFPwn68odXI- Received: from [97.82.92.46] by web63603.mail.re1.yahoo.com via HTTP; Tue, 23 Dec 2008 14:18:26 PST X-Mailer: YahooMailWebService/0.7.260.1 Date: Tue, 23 Dec 2008 14:18:26 -0800 (PST) From: Andy - KU4XR To: rsgb_lf_group@blacksheep.org In-Reply-To: <008c01c9652f$5e5d4950$0301a8c0@mal769a60aa920> MIME-Version: 1.0 Message-ID: <197998.13254.qm@web63603.mail.re1.yahoo.com> X-Karma: 0: DomainKey-Status: good (testing) X-Spam-Score: 0.9 (/) X-Spam-Report: autolearn=disabled,DNS_FROM_RFC_WHOIS=0.879 Subject: Re: LF: wspr Narrow Bandwidth Content-Type: text/plain; charset=us-ascii X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=FORGED_YAHOO_RCVD 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 http://www.kc3ol.dynip.com/forums/showthread.php?t=369 Mal: follow that link and you will see that Yes narrow filters do work with WSPR reception. If you know the exact frequency of the transmitting station, you can go as narrow as 10Hz if you choose. The wider BW, the, more stations you can receive, the narrower BW, fewer stations come through. WSPR software monitors 200Hz, YOU!! can monitor any BW you want inside the software. Andy - KU4XR - EM75xr - Friendsville, TN. LOWfer Beacon " XR " @ 184.322 KHz ( QRSS-60 ) Coordinates: N: 35* 43' 54" - W: 84* 3' 16" http://www.myspace.com/beaconxr --- On Tue, 12/23/08, mal hamilton wrote: > From: mal hamilton > Subject: LF: wspr > To: "rsgb" > Date: Tuesday, December 23, 2008, 1:50 PM > If recent published info is correct, this specifies a > bandwidth of 6hz why is USB with a bandwidth of 3 khz > necessary to receive this transmission. > Surely it would be obvious that CW mode was more > appropriate where one could use a narrow filter and dsp > processor of a few hertz. > I have asked this question before but never got an answer. > g3kev