Return-Path: Received: from mtain-da07.r1000.mx.aol.com (mtain-da07.r1000.mx.aol.com [172.29.64.79]) by air-da09.mail.aol.com (v127_r1.1) with ESMTP id MAILINDA094-86934b8af7c9be; Sun, 28 Feb 2010 18:10:01 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-da07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1FD05380000EA; Sun, 28 Feb 2010 18:09:59 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NlsFL-0001pv-Qk for rs_out_1@blacksheep.org; Sun, 28 Feb 2010 23:08:23 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NlsFL-0001pm-Cr for rsgb_lf_group@blacksheep.org; Sun, 28 Feb 2010 23:08:23 +0000 Received: from lnx500.hrz.tu-darmstadt.de ([130.83.156.225]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NlsFJ-0002Gf-K6 for rsgb_lf_group@blacksheep.org; Sun, 28 Feb 2010 23:08:23 +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 o1SN8IEA025536 for ; Mon, 1 Mar 2010 00:08:19 +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 ; Mon, 01 Mar 2010 00:08:18 +0100 Content-class: urn:content-classes:message MIME-Version: 1.0 X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Mon, 1 Mar 2010 00:08:18 +0100 Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B27@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: <38A51B74B884D74083D7950AD0DD85E82A1B27@File-Server-HST.hst.e-technik.tu-darmstadt.de> Thread-Topic: VLF TX experiments_short report Thread-Index: Acq4mESDPjb78stGTB+8KzZVuzVSGgAL6HAX References: <38A51B74B884D74083D7950AD0DD85E82A1B21@File-Server-HST.hst.e-technik.tu-darmstadt.de> <8F98AB84B99B4DC1BBD55E264D6FC983@Black> <000d01cab88f$63d380c0$0301a8c0@your91hoehfy9g> <4B8A9A8A.5070708@dsl.pipex.com> 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: 2010.2.28.230039 X-PMX-SPAMCHECK: outgoing mail X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01CAB8CA.E9F72BBF" Subject: LF: VLF TX experiments_short report 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: 5400.1158/55634 X-AOL-VSS-CODE: clean x-aol-sid: 3039ac1d404f4b8af7c72b79 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) ------_=_NextPart_001_01CAB8CA.E9F72BBF Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear LF,=20 I am sorry that it was not possible to transmit today. Maybe you have hear= d about the strong storm that damaged many trees and houses today. It woul= dn't have been a good idea to be on the hill to that time..=20 A second problem was my DDS VFO. I saw that the duty cycle of the rectangu= lar output was not 50%. So i had to modify the drivers circuit, adding a= CMOS4013 as a f divider and apply 2*f at it's input now.=20 What i wanted to use as the PA is a prototype of a SMPS that was designed= to operate at abt 50kHz. At 9kHz the ferrite core was already driven in= saturation. By varying the driving f i found, where the saturation occurs= . Then i have known how many primary turns i have to spend at 9kHz. After= applying the new windings everything was right. But the time i had was go= ne and the wind was already to strong. So i told Markus to inform you... Now playing/increasing with the number of output windings of the SMPS tran= sformer i applied the output voltage by a ordinary loudspeaker cable to th= e primary air coil that is inductive coupled to the HV coil. I got 1,6kV= rms by applying 60W at the 12V DC input, really not much :-( But anyway= it will be suitable for a first test if a apply 6dB more power or so. Lastly i have to get another coil that has more L and Q, so that no parall= el C will be needed. I will try to do that in the next week. Tomorrow i do= not have to work and will spend time improving the PA (trying how much po= wer is possible until the heat sink gets to warm and so on). Then, if the= wind will be not to strong any more, i will do some tests on the hill, me= asuring R and C and so on... Will keep you informed. Rik, Pete, anything new dreamers records? Pete, have you increased your po= wer? If you want i could send you a simple circuit for the PA, if you want= . Dimensioning is really uncritical, switching losses as well, at those lo= w frequencies. That's one of the advantages ;-)=20 GN es GL!! 73 de Stefan/DK7FC PS: Just as 160m is called "Top band" we could call 9kHz the "Dreamers ban= d". 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