Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-db01.r1000.mx.aol.com (Internet Inbound) with ESMTP id C78593800009F; Mon, 28 May 2012 12:40:53 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SZ2yv-00075K-F7 for rs_out_1@blacksheep.org; Mon, 28 May 2012 17:39:45 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SZ2yv-00075B-20 for rsgb_lf_group@blacksheep.org; Mon, 28 May 2012 17:39:45 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1SZ2yt-0005bS-6J for rsgb_lf_group@blacksheep.org; Mon, 28 May 2012 17:39:43 +0100 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 q4SGdeUq015784 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 28 May 2012 18:39:41 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q4SGdfCB014301 for ; Mon, 28 May 2012 18:39:41 +0200 Message-ID: <4FC3A9FB.8020907@iup.uni-heidelberg.de> Date: Mon, 28 May 2012 18:38:19 +0200 From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4FC39CF3.7020701@legal-medicine.de> In-Reply-To: <4FC39CF3.7020701@legal-medicine.de> X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Peter, Am 28.05.2012 17:42, schrieb pws: > Hi, > > After all those meta-discussions here's a more serious problem: > > I'm playing around with a new e-field probe based on the INA111. > http://www.ti.com/product/ina111 > > Schematic: http://www.df3lp.de/misc/rx/INA111_preamp.png [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [129.206.100.212 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 046f068074e745d5c60ca47deee9b503 Subject: Re: LF: VLF/LF-Preamp Content-Type: text/plain; charset=ISO-8859-15; 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-SCOLL-SCORE: 0:2:440074592:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40554fc3aa947937 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Peter, Am 28.05.2012 17:42, schrieb pws: > Hi, > > After all those meta-discussions here's a more serious problem: > > I'm playing around with a new e-field probe based on the INA111. > http://www.ti.com/product/ina111 > > Schematic: http://www.df3lp.de/misc/rx/INA111_preamp.png Interesting. But where do you get the special parts from? What is the lower cut-off frequency? > > It's working fine and the local interferences are lower compared to > my old non-balanced design running here on balcony. That was the goal. > > Amplification is quite enough to drive a M-Audio audiophile 192 > soundcard. > There's a second transformer (1:4) at the af-inputs. The coupling > capacitance of those transformers are below 10pF each. > > I'm using the shields of a thin double coaxial line for bringing up > the supply voltage. The voltage splitter is located at the far end > inside the small amplifier box. > > The problem is that I'm observing to a lot of interferences/microphonics > "from behind" when touching the battery located inside the house. > > ??? Changing capacity between you and the electrode (s)? Why do you touch the battery? :-) Any problems when it is in normal use? 73, Stefan > > Peter, df3lp