Return-Path: Received: (qmail 8921 invoked from network); 22 May 2000 13:16:56 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by bells.core.plus.net.uk with SMTP; 22 May 2000 13:16:56 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12tryV-00026z-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 22 May 2000 14:10:27 +0100 Received: from ulexite.lion-access.net ([212.19.217.2]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12tryR-00026p-00 for rsgb_lf_group@blacksheep.org; Mon, 22 May 2000 14:10:23 +0100 Received: from w8k3f0 (1Cust55.tnt14.rtm1.nl.uu.net [213.53.2.55]) by ulexite.lion-access.net (I-Lab) with SMTP id DF53AFB14A for ; Mon, 22 May 2000 12:08:56 -0100 (GMT) Message-ID: <009501bfc3ef$311dcd60$370235d5@w8k3f0> From: "Dick Rollema" To: rsgb_lf_group@blacksheep.org References: <09e401bfbc0e$5e55ab60$2301a8c0@maly.cz.gmc.net> <391C6885.A4BB64A8@bellatlantic.net> <001c01bfbcbe$1b0fed60$a747b28f@w8k3f0> <391DC6F3.A51@xtra.co.nz> <007601bfbf7a$c587f440$120035d5@w8k3f0> <39226F30.40FE@xtra.co.nz> <000901bfc099$3c9525c0$40d899d4@w8k3f0> <3925CDB0.6E3C@xtra.co.nz> <002b01bfc239$ea9019e0$2546b28f@w8k3f0> <003301bfc33c$fe42ada0$d097073e@dave> Subject: LF: Re: Re: Re: Best tone for aural copy Date: Mon, 22 May 2000 14:52:44 +0200 Organization: Freeler MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2314.1300 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: To All from PA0SE Dave, G3YMC wrote > 3. On the subject of receive notes. I also noted that Harry optimises his > filter for 1kHz. Many operators including myself prefer a lower note, > 600-800Hz or even lower. I suspect it is the optimisation of the frequency > relative to background noise, and with a narrow audio filter may be less > noticeable> The Swedish thesis shows that around 500Hz the ear/brain is at its best in copying wek signals in noise. 73, Dick, PA0SE