Return-Path: Received: from mtain-md10.r1000.mx.aol.com (mtain-md10.r1000.mx.aol.com [172.29.96.94]) by air-da06.mail.aol.com (v129.4) with ESMTP id MAILINDA063-863e4cc74ccc7f; Tue, 26 Oct 2010 17:49:00 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 98D4F380000AC; Tue, 26 Oct 2010 17:48:58 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PArMM-00086f-Te for rs_out_1@blacksheep.org; Tue, 26 Oct 2010 22:47:10 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PArMM-00086W-E5 for rsgb_lf_group@blacksheep.org; Tue, 26 Oct 2010 22:47:10 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PArMK-00079H-QM for rsgb_lf_group@blacksheep.org; Tue, 26 Oct 2010 22:47:10 +0100 Received: from ix.urz.uni-heidelberg.de (cyrus-portal.urz.uni-heidelberg.de [129.206.100.176]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id o9QLkVJl016792 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 26 Oct 2010 23:46:32 +0200 Received: from extmail.urz.uni-heidelberg.de (extmail.urz.uni-heidelberg.de [129.206.100.140]) by ix.urz.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id o9QLl7XO026364 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 26 Oct 2010 23:47:07 +0200 Received: from [147.142.9.71] (vpn509-071.rzuser.uni-heidelberg.de [147.142.9.71]) by extmail.urz.uni-heidelberg.de (8.13.4/8.13.1) with ESMTP id o9QLkfsF031144 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 26 Oct 2010 23:46:42 +0200 Message-ID: <4CC74C5E.9030203@iup.uni-heidelberg.de> Date: Tue, 26 Oct 2010 23:47:10 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.11) Gecko/20100711 Thunderbird/3.0.6 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4CC74304.3090903@iup.uni-heidelberg.de> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: VLF: whistler duct AMATEUR propagation Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: 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-aol-global-disposition: G x-aol-sid: 3039ac1d605e4cc74cca5f1e X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Hi Roger, Am 26.10.2010 23:18, schrieb Roger Lapthorn: > Stefan, > > The possibility of whistler duct AMATEUR propagation is fascinating. > There are (I think) spectrograms of such propagation from NAA (~14kHz) > back in the 1965 book "Whistlers and Related Ionospheric Phenomena" by > J.A.Hellliwell (I have a copy). This could mean signals getting to, > for example, conjugate locations in the southern hemisphere > (S.Africa?) with relatively low attenuation. A chirped signal would > also show whisper dispersion I guess. Yes, absolutely interesting! We will do that! And SpecLab can easily generate such a signal, my PA can easily transmit such a signal and my earth antenna can easily radiate such a (broad band) signal! :-) Any further hints/ideas, Roger (and the group)? > > You will need some grabbers in distant places! Maybe ZL2AFP can help us here by receiving? :-) 73, Stefan