Return-Path: Received: from rly-mg02.mx.aol.com (rly-mg02.mail.aol.com [172.20.83.108]) by air-mg10.mail.aol.com (v126.13) with ESMTP id MAILINMG104-9fd4b19931a124; Fri, 04 Dec 2009 17:54:21 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mg02.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMG027-9fd4b19931a124; Fri, 04 Dec 2009 17:54:19 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NGh1g-0003KN-8K for rs_out_1@blacksheep.org; Fri, 04 Dec 2009 22:53:24 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NGh1f-0003KE-3n for rsgb_lf_group@blacksheep.org; Fri, 04 Dec 2009 22:53:23 +0000 Received: from elasmtp-curtail.atl.sa.earthlink.net ([209.86.89.64]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NGh1c-0001Dv-Om for rsgb_lf_group@blacksheep.org; Fri, 04 Dec 2009 22:53:23 +0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=aycvjIZ40s2jyok+i3vME+xNkWXYrRjdKgM5+HfgiZAoCJu7s4wbs9ncZ4LIHKqX; h=Received:Message-ID:Reply-To:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [4.240.15.219] (helo=ctrask) by elasmtp-curtail.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1NGh1U-0000Li-3V for rsgb_lf_group@blacksheep.org; Fri, 04 Dec 2009 17:53:12 -0500 Message-ID: <005601ca7534$6ea90400$030ff004@ctrask> From: "Chris Trask" To: References: <38A51B74B884D74083D7950AD0DD85E828AB4A@File-Server-HST.hst.e-technik.tu-darmstadt.de> Date: Fri, 4 Dec 2009 15:52:16 -0700 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-ELNK-Trace: b77fdb70683249914713efb067f9a722239a348a220c26096da3359035de6f24825802b274c8b311350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 4.240.15.219 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: Re: Active Antenna Preamp of Bernd/DF8ZR Content-Type: text/plain; charset="iso-8859-1" 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-IP: 193.82.116.20 > > > Now, Bernd has posted the circuit of his preamp for active antennas: > > > > http://www.mydarc.de/df8zr/lf-active-antenna.pdf > > > > It's nothing fundamental new. But it's just working very fine, with an > > overvoltage shielded input. DLF (153kHz) gets attenuated by abt 40dB, > > compared to the sigs in the wanted frequency range. Gain is abt 23dB. > > It was published in summer 2003 in the CQDL. > > The URL is an invalid one > Works okay here. Chris