Return-Path: Received: (qmail 63359 invoked from network); 28 Mar 2005 15:00:58 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore02.plus.net with SMTP; 28 Mar 2005 15:00:58 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DFvp2-0003zr-76 for dave@picks.force9.co.uk; Mon, 28 Mar 2005 16:06:32 +0100 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DFvp2-0003zo-4n for dave@picks.force9.co.uk; Mon, 28 Mar 2005 16:06:32 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1DFvmI-0008FD-TA for dave@picks.force9.co.uk; Mon, 28 Mar 2005 16:03:43 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DFvjR-00022x-51 for rs_out_1@blacksheep.org; Mon, 28 Mar 2005 16:00:45 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DFvjQ-00022o-Pu for rsgb_lf_group@blacksheep.org; Mon, 28 Mar 2005 16:00:44 +0100 Received: from smtp2.versatel.nl ([62.58.50.89]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DFvjO-0000ap-DG for rsgb_lf_group@blacksheep.org; Mon, 28 Mar 2005 16:00:44 +0100 Received: (qmail 27482 invoked by uid 10); 28 Mar 2005 15:00:37 -0000 Received: (vexira-qq 27360-839189BD invoked from network) 28 Mar 2005 17:00:32 +0200 Received: from unknown (HELO ibm) ([62.59.191.56]) (envelope-sender ) by smtp2.versatel.nl (qmail-ldap-1.03) with SMTP for < >; 28 Mar 2005 15:00:32 -0000 Message-ID: <001301c533a6$e3f37c60$2102000a@ibm> From: "Dick" To: rsgb_lf_group@blacksheep.org Date: Mon, 28 Mar 2005 17:00:29 +0200 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 V5.00.2615.200 X-AntiVirus: checked by Vexira MailArmor (version: 2.0.1.16; VAE: 6.30.0.2; VDF: 6.30.0.11; host: postbode02.zonnet.nl) X-SPF-Result: relay.thorcom.net: 62.58.50.89 is neither permitted nor denied by domain of zonnet.nl X-Spam-Score: 0.5 (/) X-Spam-Report: autolearn=no,FROM_ENDS_IN_NUMS=0.516 Subject: LF: the use of Epcos cores on LF Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) A question, especially for our German members. Epcos makes (big) cores of so called N30 material. I previously used an 58mm core to match 50 Ohm to 135Ohm, but it got really hot at around 400-500Watt or so. I wonder if this is normal or not (Ui=4300) These cores are relatively cheap, so I hoped it was a good solution for big (output) transformers. Now I am not to sure anymore........... Also interested to know if anyone has experience in using a low beverage, let's say 400-500m long at 1m heigth as TX antenna. Not earthed/resistor at the end, just a simple very long wire at 1m heigth. 73 Dick, pa4vhf