Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: (qmail 46287 invoked from network); 23 Jan 2004 19:49:23 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore02.plus.net with SMTP; 23 Jan 2004 19:49:23 -0000 Received: (qmail 6021 invoked from network); 23 Jan 2004 19:49:23 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 23 Jan 2004 19:49:22 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1Ak7Iv-0001S3-Sc for dave@picks.force9.co.uk; Fri, 23 Jan 2004 19:49:22 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Ak7IJ-0003dC-0Z for rs_out@blacksheep.org; Fri, 23 Jan 2004 19:48:43 +0000 Received: from [62.58.50.89] (helo=postbode02.zonnet.nl) by post.thorcom.com with esmtp (Exim 4.14) id 1Ak7IH-0003cz-MN for rsgb_lf_group@blacksheep.org; Fri, 23 Jan 2004 19:48:41 +0000 Received: (qmail 25046 invoked by uid 10); 23 Jan 2004 19:48:10 -0000 Received: (vexira-qq 24970-B5E440BD invoked from network) 23 Jan 2004 20:48:09 +0100 X-Fake-Domain: unknown Received: from unknown (HELO ibm) ([62.59.191.49]) (envelope-sender <knaap159@zonnet.nl>) by postbode02.zonnet.nl (qmail-ldap-1.03) with SMTP for < >; 23 Jan 2004 19:48:09 -0000 X-Bad-Message-ID: no DNS (ibm) Message-ID: <002501c3e1e8$cee237a0$2102000a@ibm> From: "Dick" <knaap159@zonnet.nl> To: rsgb_lf_group@blacksheep.org References: <000c01c3e02e$600a21a0$01eafc3e@l8p8y6> <001501c3e058$ba617980$2102000a@ibm> <002501c3e121$12a54fe0$2102000a@ibm> <000201c3e18c$03c4b540$40e5fc3e@l8p8y6> Date: Fri, 23 Jan 2004 20:40:06 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Antivirus: checked by Vexira MailArmor (version: 2.0.1.16; VAE: 6.23.0.2; VDF: 6.23.0.29; host: postbode02.zonnet.nl) Subject: LF: my 137 kHz project...... Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.3 required=5.0 tests=FROM_ENDS_IN_NUMS,HTML_20_30,HTML_MESSAGE autolearn=no version=2.60 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@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 2 Content-transfer-encoding: 8bit <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" http-equiv=Content-Type> <META content="MSHTML 5.00.2614.3500" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV> </DIV> <DIV><FONT face=Arial size=2>Well, despite first negative results I now seems to get some positive results.........</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>Thanks to all here for the "physical support" , it keeps me involved.........</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>For Mal, and others,...I just first want to get my costs as low as possible by using</FONT></DIV> <DIV><FONT face=Arial size=2>things I have in my junkbox.</FONT></DIV> <DIV><FONT face=Arial size=2>I soon expect to get a number of old (defect) SMPS-computer power supplies, which</FONT></DIV> <DIV><FONT face=Arial size=2>at least contains an T106-26 core as well as an larger transformer.</FONT></DIV> <DIV><FONT face=Arial size=2>Not sure about the FET's in these supplies, but when having several in my junkbox</FONT></DIV> <DIV><FONT face=Arial size=2>it will be not a big problem when loosing some of them.</FONT></DIV> <DIV><FONT face=Arial size=2>Meanwhile I also dismanteld some old computer monitors, which seem to be a nice</FONT></DIV> <DIV><FONT face=Arial size=2>source for various components too. (some high-voltage/low loss capacitors. as well!!)</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>Meanwhile I ad an 7805 regulator to my circuit; lowering the ouput level to +7dBm.</FONT></DIV> <DIV><FONT face=Arial size=2>I'm keying the 4060 on pin 12 , and that seems to work well.</FONT></DIV> <DIV><FONT face=Arial size=2>Next will be the TDA2030 amp. Rich, OM2TW advised an high permeability core in</FONT></DIV> <DIV><FONT face=Arial size=2>the step up transformer >2000.</FONT></DIV> <DIV><FONT face=Arial size=2>I will test some core's......got a grey one, might be an 3C90 or what ever, no idea.</FONT></DIV> <DIV><FONT face=Arial size=2>I just give it a try............</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>I am luck to have some nice transformers available; one of them is a 42V/20A device...........</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>With the start on LF, a lot of 'related to' work has to be done, like constructing special</FONT></DIV> <DIV><FONT face=Arial size=2>measuring equipement, power supply, dummy load etc.</FONT></DIV> <DIV><FONT face=Arial size=2>I do have a quite large and various amount of PVC pipe's (left-overs!) some of them being</FONT></DIV> <DIV><FONT face=Arial size=2>20-30cm in diameter.....great stuff for large coils!</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>Well, now I'm returning to the soldering iron, and hopefully will rise my power above 1 Watt (hihi)</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>73</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>Dick pa4vhf (now QRppppppppppp on 137kHz in a 50 Ohm resistor..........)</FONT></DIV> <DIV> </DIV> <DIV> </DIV></BODY></HTML>