Return-Path: 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 ) 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" 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: 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

Well, despite first negative results I now seems to get some positive results.........

Thanks to all here for the "physical support" , it keeps me involved.........

For Mal, and others,...I just first want to get my costs as low as possible by using

things I have in my junkbox.

I soon expect to get a number of old (defect) SMPS-computer power supplies, which

at least contains an T106-26 core as well as an larger transformer.

Not sure about the FET's in these supplies, but when having several in my junkbox

it will be not a big problem when loosing some of them.

Meanwhile I also dismanteld some old computer monitors, which seem to be a nice

source for various components too. (some high-voltage/low loss capacitors. as well!!)

Meanwhile I ad an 7805 regulator to my circuit; lowering the ouput level to +7dBm.

I'm keying the 4060 on pin 12 , and that seems to work well.

Next will be the TDA2030 amp. Rich, OM2TW advised an high permeability core in

the step up transformer >2000.

I will test some core's......got a grey one, might be an 3C90 or what ever, no idea.

I just give it a try............

I am luck to have some nice transformers available; one of them is a 42V/20A device...........

With the start on LF, a lot of 'related to' work has to be done, like constructing special

measuring equipement, power supply, dummy load etc.

I do have a quite large and various amount of PVC pipe's (left-overs!) some of them being

20-30cm in diameter.....great stuff for large coils!

Well, now I'm returning to the soldering iron, and hopefully will rise my power above 1 Watt (hihi)

Dick pa4vhf (now QRppppppppppp on 137kHz in a 50 Ohm resistor..........)