Return-Path: Received: from mtain-dc08.r1000.mx.aol.com (mtain-dc08.r1000.mx.aol.com [172.29.64.136]) by air-ma06.mail.aol.com (v127_r1.1) with ESMTP id MAILINMA063-b52a4b99651d3e1; Thu, 11 Mar 2010 16:48:13 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dc08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9833F380000C3; Thu, 11 Mar 2010 16:48:09 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NpqDv-0001fi-HW for rs_out_1@blacksheep.org; Thu, 11 Mar 2010 21:47:19 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NpqDu-0001fZ-V8 for rsgb_lf_group@blacksheep.org; Thu, 11 Mar 2010 21:47:18 +0000 Received: from lnx500.hrz.tu-darmstadt.de ([130.83.156.225]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NpqDr-0006xo-V9 for rsgb_lf_group@blacksheep.org; Thu, 11 Mar 2010 21:47:18 +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 lnx500.hrz.tu-darmstadt.de (8.14.2/8.14.2/HRZ/PMX) with SMTP id o2BLlEZO014712 for ; Thu, 11 Mar 2010 22:47:14 +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 ; Thu, 11 Mar 2010 22:47:14 +0100 Content-class: urn:content-classes:message MIME-Version: 1.0 X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Thu, 11 Mar 2010 22:47:14 +0100 Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B54@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: <38A51B74B884D74083D7950AD0DD85E82A1B54@File-Server-HST.hst.e-technik.tu-darmstadt.de> Thread-Topic: LF: Re: DREAM 9 ANTENNA Thread-Index: AcrBYKPceWVv20S1QOGbu5ofWozvcgAAYEqA References: <000a01cac139$b9d5e5a0$0401a8c0@xphd97xgq27nyf> <9D7C2F9B306347BEA848AC1560D1162B@JimPC> <4B995D52.6000802@abelian.org> From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= To: X-AVK-Virus-Check: AVB 19.717;31.01.2010 X-PMX-TU: seen v0.99a by 5.5.9.388399, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2010.3.11.213626 X-PMX-SPAMCHECK: outgoing mail X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01CAC164.695C6256" Subject: AW: LF: Re: DREAM 9 ANTENNA 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-VSS-INFO: 5400.1158/56111 X-AOL-VSS-CODE: clean x-aol-sid: 3039ac1d40884b9965192508 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) ------_=_NextPart_001_01CAC164.695C6256 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable On <9KHz there is only the need for a transformation to an impedance range= say below 100 Ohm so that voltages are not to high and currents are not= to high. 1 Ohm is to less i mean, unless the primary coil is not fed dire= ctly through the output transformer; so the PA is directly placed at the= loading coil. That may be problematic due to the high E-fields, so better= spend some meters of standard loudspeaker cable and keep the PA apart fro= m the coil . The region of 50 to 100Ohm is a good choice. Transforming to= 50 Ohm is necessary if there are measuring devices that work properly in= this impedance region, such as 5 pole low pass filters or swr meters. But= most of us will start just with an antenna in resonance and maximum anten= na current, the PA will give. Normally tapping is one way for matching. But on VLF the L will be extreme= and so one can just choose small wires. Therefore it is better to use a= inductive coupled primary coil out of bigger wire since there will be muc= h higher currents in the primary impedance level. But that are the basics and we all know them from LF so there might be jus= t some missunderstandings here ;-) Stefan/DK7FC ------_=_NextPart_001_01CAC164.695C6256 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: base64 eJ8+Ig8VAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy b3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEgAEAHAAAAEFXOiBMRjogUmU6IERSRUFN IDkgQU5URU5OQQDWBgEFgAMADgAAANoHAwALABYALwAOAAQARgEBIIADAA4AAADaBwMACwAWAC8A DgAEAEYBAQmAAQAhAAAAOTI3QUREN0I5MTcxMDU0OEI4Q0E0M0VCRTlCMDE3MzAALgcBA5AGAPAM AAA4AAAAAwA2AAAAAABAADkAVmJcaWTBygEeAD0AAQAAAAUAAABBVzogAAAAAAIBRwABAAAAMgAA AGM9REU7YT0gO3A9SFNUO2w9RklMRS1TRVJWRVItSC0xMDAzMTEyMTQ3MTRaLTE3NjAAAAAeAEkA AQAAABwAAABSZTogTEY6IFJlOiBEUkVBTSA5IEFOVEVOTkEAQABOAAA1S+dfwcoBHgBaAAEAAAAj AAAAb3duZXItcnNnYl9sZl9ncm91cEBibGFja3NoZWVwLm9yZwAAAgFbAAEAAABjAAAAAAAAAIEr H6S+oxAZnW4A3QEPVAIAAAAAb3duZXItcnNnYl9sZl9ncm91cEBibGFja3NoZWVwLm9yZwBTTVRQ 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