Return-Path: Received: from mtain-mi09.r1000.mx.aol.com (mtain-mi09.r1000.mail.aol.com [172.21.131.167]) by air-me05.mail.aol.com (v127_r1.1) with ESMTP id MAILINME054-8bb34b8e7fbe227; Wed, 03 Mar 2010 10:26:54 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mi09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5CD05380000D6; Wed, 3 Mar 2010 10:26:52 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NmqSa-0007EE-AI for rs_out_1@blacksheep.org; Wed, 03 Mar 2010 15:26:04 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NmqSZ-0007E5-Vf for rsgb_lf_group@blacksheep.org; Wed, 03 Mar 2010 15:26:03 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NmqSY-0007ux-6t for rsgb_lf_group@blacksheep.org; Wed, 03 Mar 2010 15:26:03 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id o23FPxnf011897 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 3 Mar 2010 16:25:59 +0100 Received: from [129.206.29.99] (pc99.iup.uni-heidelberg.de [129.206.29.99]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id o23FQ14x014077 for ; Wed, 3 Mar 2010 16:26:01 +0100 Message-ID: <4B8E8027.3060809@iup.uni-heidelberg.de> Date: Wed, 03 Mar 2010 16:28:39 +0100 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.7) Gecko/20100111 Thunderbird/3.0.1 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Re: 9kHz noise level 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: 3039400cded14b8e7fbc2a85 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Am 03.03.2010 12:50, schrieb Paul Nicholson: > Yes, given a low Z source - no good for E-field rx. On the input of the E-field antenna i use a JFET (BF862), then a narrow band pass filter and after that the LT1028. As the output stage i use again the BF862, driving a fiber optical TX LED. Then, the RX signal is transmitted by a fiber optic cable into the shack. Back-converting with a SFH350V photo transistor... 73, Stefan/7fc