Return-Path: Received: (qmail 19287 invoked from network); 7 Jun 2000 01:23:37 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by teachers.core.plus.net.uk with SMTP; 7 Jun 2000 01:23:37 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12zVD0-0004er-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 07 Jun 2000 03:04:42 +0100 Received: from teapot29.domain7.bigpond.com ([139.134.5.236]) by post.thorcom.com with smtp (Exim 3.02 #1) id 12zVCz-0004ej-00 for rsgb_lf_group@blacksheep.org; Wed, 07 Jun 2000 03:04:41 +0100 Received: from localhost (localhost [127.0.0.1]) by teapot29.domain7.bigpond.com (NTMail 3.02.13) with ESMTP id ja972045 for ; Wed, 7 Jun 2000 11:17:47 +1000 Received: from MOIP-A-002-pool-66.tmns.net.au ([139.134.91.66]) by mail7.bigpond.com (Claudes-Germane-MailRouter V2.7e 15/2507777); 07 Jun 2000 11:17:46 Message-ID: <002901bfd01e$685bb4a0$425b868b@zimslaptop> From: "Graeme Zimmer" To: rsgb_lf_group@blacksheep.org References: <001701bfcfa9$ea7322e0$1fd499d4@w8k3f0> <$EFdbGAbFRP5EwTv@pickmere.demon.co.uk> Subject: Re: LF: Re: Copying CW Date: Wed, 7 Jun 2000 11:19:18 +1000 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 5.00.2919.6600 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: Greetings, > Don't forget the old trick of fixing a loudspeaker to the end of a pipe > and using the organ pipe resonance frequency. Re Resonant Loudspeakers.. You might like to look at http://www.io.com/~maddog/hamradio/res_spkr.htm cheers ................... Zim