Return-Path: Received: (qmail 22802 invoked from network); 3 Oct 2002 17:32:03 -0000 Received: from mx.last.plus.net (212.159.3.230) by mailstore with SMTP; 3 Oct 2002 17:32:03 -0000 Received: (qmail 9947 invoked from network); 3 Oct 2002 15:51:32 -0000 Received: from post.thorcom.com (193.82.116.70) by mx.last.plus.net with SMTP; 3 Oct 2002 15:51:32 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 17x8Of-0000xI-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 03 Oct 2002 17:00:17 +0100 Received: from [194.247.47.231] (helo=mailout.zetnet.co.uk ident=mail) by post.thorcom.com with esmtp (Exim 4.10) id 17x8Of-0000x8-00 for rsgb_lf_group@blacksheep.org; Thu, 03 Oct 2002 17:00:17 +0100 Received: from irwell.zetnet.co.uk ([194.247.47.48] helo=zetnet.co.uk) by mailout.zetnet.co.uk with esmtp (Exim 3.35 #1 (Debian)) id 17x8Of-0004Gj-00 for ; Thu, 03 Oct 2002 17:00:17 +0100 Received: from a7j7r2 (bts-0243.dialup.zetnet.co.uk [194.247.48.243]) by zetnet.co.uk (8.11.3/8.11.3/Debian 8.11.2-1) with SMTP id g93G0DP15186 for ; Thu, 3 Oct 2002 17:00:13 +0100 Message-ID: <007001c26af4$bfb0e180$f330f7c2@a7j7r2> From: "John Rabson" To: rsgb_lf_group@blacksheep.org Date: Thu, 3 Oct 2002 16:16:33 +0100 MIME-Version: 1.0 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 Subject: LF: Bone mike for the Heyphone Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=0.0 required=5.0tests=noneversion=2.31 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group I have had a request from a group of cave divers for an alternative to a conventional handset for this radio. An ordinary mike/loudspeaker setup is not ideal when one has come up for air and is still wearing a full diving outfit. One of the divers has seen a bone microphone/loudspeaker which belongs to Derbyshire Cave Rescue Organisation and wonders if it would be suitable for use with the Heyphone. To check this out I need such a microphone, but cannot borrow the Derbyshire one as to do so might compromise their readiness. The unit is known locally as a Talking Rope and is believed to be of army surplus origin. I understand that it does appear to have a stores code, but this is on a little rubber sheath on the cable and is so perished as to be virtually indecipherable. The best guess is:- APP?78 147928 but the only certain reading is AP???8 ??79??. Can anyone identified this unit please? Regards, John Rabson Editor Cave Radio and Electronics Journal