Return-Path: Received: (qmail 6713 invoked from network); 2 May 2003 15:07:40 -0000 Content-Transfer-Encoding: 8bit Received: from netmail01.services.quay.plus.net (212.159.14.219) by mailstore with SMTP; 2 May 2003 15:07:40 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 19870 invoked by uid 10001); 2 May 2003 15:07:39 -0000 Received: from post.thorcom.com (193.82.116.70) by netmail01.services.quay.plus.net with SMTP; 2 May 2003 15:07:39 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.14) id 19Bbcv-0003GK-Ix for rsgb_lf_group-outgoing@blacksheep.org; Fri, 02 May 2003 15:35:05 +0100 Received: from [194.217.242.85] (helo=anchor-post-35.mail.demon.net) by post.thorcom.com with esmtp (Exim 4.14) id 19Bbcq-0003GB-GP for rsgb_lf_group@blacksheep.org; Fri, 02 May 2003 15:35:00 +0100 Received: from pickmere.demon.co.uk ([158.152.117.143]) by anchor-post-35.mail.demon.net with esmtp (Exim 3.36 #2) id 19Bbcp-0001dP-0Z for rsgb_lf_group@blacksheep.org; Fri, 02 May 2003 15:34:59 +0100 Message-ID: Date: Fri, 2 May 2003 14:04:09 +0100 To: rsgb_lf_group@blacksheep.org From: "M. J. Powell" Disposition-Notification-To: "M. J. Powell" References: <002b01c3109e$081b7440$3704210a@Hugh> In-reply-to: <002b01c3109e$081b7440$3704210a@Hugh> MIME-Version: 1.0 User-Agent: Turnpike/6.01-S () Subject: Re: LF: Way off subject ... and totally batty Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Status: No, hits=-9.9 required=5.0tests=IN_REP_TO,REFERENCES,USER_AGENTversion=2.53 X-Spam-Checker-Version: SpamAssassin 2.53 (1.174.2.15-2003-03-30-exp) X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false In message <002b01c3109e$081b7440$3704210a@Hugh>, Hugh M0WYE writes >Hi group, >Has anyone else tried this with their LF/VLF receivers ? > >I have put a microphone on my SLM and have been receiving bats. I used a >tiny electret condenser mic capsule on the input of the D2006, with the >usual 1.5V cell and blocking cap to power the capsule. I was able to pick up >bat sounds up to 55kHz. There were some clicks down at 22.5kHz, and some >twitters around 45kHz. I think they are just the common or garden >Pipistrelle bats. > >The bats are attracted to our big halogen security lamp, because of the >insects that fly round it. > >I haven't fed the signals into Argo yet ... Apparently they use an increased PRF as they home in to their prey. Mike -- M.J.Powell