Return-Path: Received: (qmail 12974 invoked from network); 12 Jan 2005 22:15:54 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 12 Jan 2005 22:15:54 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CoqmI-0005NL-H7 for dave@picks.force9.co.uk; Wed, 12 Jan 2005 22:15:50 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CoqmE-0005La-Iy for dave@picks.force9.co.uk; Wed, 12 Jan 2005 22:15:42 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1CoqmH-0005X2-J6 for dave@picks.force9.co.uk; Wed, 12 Jan 2005 22:15:45 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Coql4-0000Zj-Vl for rs_out_1@blacksheep.org; Wed, 12 Jan 2005 22:14:30 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Coql2-0000ZZ-Hc for rsgb_lf_group@blacksheep.org; Wed, 12 Jan 2005 22:14:28 +0000 Received: from smtp808.mail.ukl.yahoo.com ([217.12.12.198]) by relay.thorcom.net with smtp (Exim 4.43) id 1Coqkz-0007xc-2H for rsgb_lf_group@blacksheep.org; Wed, 12 Jan 2005 22:14:28 +0000 Received: from unknown (HELO Main) (Alan.Melia@213.122.39.147 with login) by smtp808.mail.ukl.yahoo.com with SMTP; 12 Jan 2005 22:14:13 -0000 Message-ID: <001001c4f8f4$14f00740$6507a8c0@Main> From: "Alan Melia" To: rsgb_lf_group@blacksheep.org References: Date: Wed, 12 Jan 2005 22:06:03 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 X-SPF-Result: relay.thorcom.net: 217.12.12.198 is neither permitted nor denied by domain of btinternet.com X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: LF: Re: Audio Filters Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Hi Gary, I find there is no advantage provided there are not strong signals on the band, which can drive the soundcard into non-linearity. As I often use the card at "too high" a level, so that I can hear the morse on the PC speakers, I do find a filter helps when there are others around. I am not sure whether the audio filter has this advantage unless you are sure that the RX is not overloading. To get round this I use the IF filter on the RX, to say just bracket the DX window at night. Under normal conditions an audio filter will gibe no advantage in fact it might even add noise. I have sometimes used a notch to do the same thing, but that was some year or two back. The ARGO FFT system is actually a series of very sharp audio filters, after all. I hope you didnt get too much more damage in the lastest winds. Cheers de Alan G3NYK alan.melia@btinternet.com ----- Original Message ----- From: "Gary - G4WGT" To: "LF (Rsgb LF Group)" Sent: 12 January 2005 20:10 Subject: LF: Audio Filters > > Hi All at LF, > > Is it useful to use a audio filter like the DATONG FL3 MULTI-MODE AUDIO > FILTER WITH NOTCH FILTER to help with QRSS receive on LF, does anyone use > one or similar? I don't have one but see the odd one or two crop up on E-Bay > at reasonable prices. > > Your comments appreciated. > > Regards > > Gary - G4WGT > > Web: http://myweb.tiscali.co.uk/wgtaylor > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.300 / Virus Database: 265.6.9 - Release Date: 06/01/2005 > >