Return-Path: Received: from rly-me09.mx.aol.com (rly-me09.mail.aol.com [172.20.83.43]) by air-me02.mail.aol.com (v126.13) with ESMTP id MAILINME024-9d94b194c4e1ce; Fri, 04 Dec 2009 12:52:23 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-me09.mx.aol.com (v125.7) with ESMTP id MAILRELAYINME095-9d94b194c4e1ce; Fri, 04 Dec 2009 12:52:16 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NGcJT-0000hp-K7 for rs_out_1@blacksheep.org; Fri, 04 Dec 2009 17:51:27 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NGcJT-0000hg-4E for rsgb_lf_group@blacksheep.org; Fri, 04 Dec 2009 17:51:27 +0000 Received: from lnx503.hrz.tu-darmstadt.de ([130.83.156.232]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NGcJR-0007Wn-Pb for rsgb_lf_group@blacksheep.org; Fri, 04 Dec 2009 17:51:27 +0000 Received: from FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de (File-Server-HST.hst.e-technik.tu-darmstadt.de [130.83.212.129]) by lnx503.hrz.tu-darmstadt.de (8.14.2/8.14.2/HRZ/PMX) with SMTP id nB4HpOLL016812 for ; Fri, 4 Dec 2009 18:51:25 +0100 (envelope-from schaefer@hst.tu-darmstadt.de) Received: from [127.0.0.1] (helo=File-Server-HST.hst.e-technik.tu-darmstadt.de) by FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de with AVK MailGateway; for ; Fri, 04 Dec 2009 18:51:24 +0100 Content-class: urn:content-classes:message MIME-Version: 1.0 X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Fri, 4 Dec 2009 18:51:24 +0100 Message-ID: <38A51B74B884D74083D7950AD0DD85E828AB4A@File-Server-HST.hst.e-technik.tu-darmstadt.de> In-Reply-To: <38A51B74B884D74083D7950AD0DD85E828AB3E@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: LF: Active Antenna Preamp of Bernd/DF8ZR Thread-Index: Acp0u1rPAGcNDuTGSSu7cfOACu+G0AAJXlNQAAoxQWA= From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= To: X-AVK-Virus-Check: AVB 19.605;04.12.2009 X-PMX-TU: seen v0.99a by 5.5.8.383112, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2009.12.4.174216 X-PMX-SPAMCHECK: outgoing mail X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CA750A.6557EDF9" Subject: LF: Active Antenna Preamp of Bernd/DF8ZR X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.2 required=5.0 tests=HTML_70_80, HTML_FONTCOLOR_UNKNOWN,HTML_MESSAGE 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 X-Mailer: Unknown (No Version) ------_=_NextPart_001_01CA750A.6557EDF9 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Lowfers,=20 =20 Now, Bernd has posted the circuit of his preamp for active antennas: http:= //www.mydarc.de/df8zr/lf-active-antenna.pdf =20 =20 It's nothing fundamental new. But it's just working very fine, with an ove= rvoltage shielded input. DLF (153kHz) gets attenuated by abt 40dB, compare= d to the sigs in the wanted frequency range. Gain is abt 23dB. It was publ= ished in summer 2003 in the CQDL...=20 =20 73, Stefan ------_=_NextPart_001_01CA750A.6557EDF9 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Lowfers, <= /font>

Now, Be= rnd has posted the circuit of his preamp for active antennas: http://www.mydarc.de/df8zr/lf-active-= antenna.pdf=

<= /span>

It̵= 7;s nothing fundamental new. But it’s just working very fine, with an overvoltag= e 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 summe= r 2003 in the CQDL…

<= /span>

73, Ste= fan

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