Return-Path: Received: from mtain-mj09.r1000.mx.aol.com (mtain-mj09.r1000.mail.aol.com [172.21.164.93]) by air-me10.mail.aol.com (v129.4) with ESMTP id MAILINME102-8bc54c3650e9399; Thu, 08 Jul 2010 18:27:54 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mj09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 66944380000EF; Thu, 8 Jul 2010 18:27:52 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OWzY5-0006Af-QJ for rs_out_1@blacksheep.org; Thu, 08 Jul 2010 23:26:29 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OWzY5-0006AW-E8 for rsgb_lf_group@blacksheep.org; Thu, 08 Jul 2010 23:26:29 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OWzY4-0001KE-Rt for rsgb_lf_group@blacksheep.org; Thu, 08 Jul 2010 23:26:29 +0100 Received: from ix.urz.uni-heidelberg.de (cyrus-portal.urz.uni-heidelberg.de [129.206.100.176]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id o68MR4c0002925 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 9 Jul 2010 00:27:05 +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 o68MQR2D016705 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 9 Jul 2010 00:26:27 +0200 Received: from [147.142.13.30] (vpn513-030.rzuser.uni-heidelberg.de [147.142.13.30]) by extmail.urz.uni-heidelberg.de (8.13.4/8.13.1) with ESMTP id o68MQFQr015132 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 9 Jul 2010 00:26:16 +0200 Message-ID: <4C3650A1.6040104@iup.uni-heidelberg.de> Date: Fri, 09 Jul 2010 00:26:41 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.10) Gecko/20100512 Thunderbird/3.0.5 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4C363DCD.303@iup.uni-heidelberg.de> In-Reply-To: <4C363DCD.303@iup.uni-heidelberg.de> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: LF: DLF passive received with earth antenna 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: 3039400c89b24c3650e83806 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Roger, LF, Just forgotten to mention: Today i tried just for fun if it is possible to make the Deutschlandfunk DLF / 153 kHz audible in a car speaker (4 Ohm) without any additional energy sources and using my 300m earth antenna that is fixed installed on the hill. It is possible! The level is not too loud but you clearly can understand all what they say when holding the speaker in a distance of 0,5m to the ear. I just used a bridge rectifier out of 4x BAT47 diodes and a 10nF C, that's all ;-) There was not really a difference when using a 1:4 audio transformer (4 Ohm on low impedance side). Currently the R-loss of the earth antenna is 1 kOhm although it was 650 Ohm in the last TX test. Probably this is due to the heat... Maybe it has to be mentioned that DLF transmitts 500 kW and is in a distance of 40 km to that QTH ;-) 73, Stefan