Return-Path: Received: from rly-dd04.mx.aol.com (rly-dd04.mail.aol.com [172.19.141.151]) by air-dd03.mail.aol.com (v121.4) with ESMTP id MAILINDD034-b75478e397e296; Wed, 16 Jan 2008 12:06:17 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dd04.mx.aol.com (v121.4) with ESMTP id MAILRELAYINDD047-b75478e397e296; Wed, 16 Jan 2008 12:06:09 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JFBhO-0005FH-M7 for rs_out_1@blacksheep.org; Wed, 16 Jan 2008 17:05:10 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JFBhO-0005F8-9p for rsgb_lf_group@blacksheep.org; Wed, 16 Jan 2008 17:05:10 +0000 Received: from mail04do.versatel.de ([89.245.129.24]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JFBhJ-0005YX-Nr for rsgb_lf_group@blacksheep.org; Wed, 16 Jan 2008 17:05:10 +0000 Received: (qmail 26989 invoked from network); 16 Jan 2008 17:04:59 -0000 Received: from webmail02.versatel-nord.de (HELO localhost) ([62.214.102.232]) (envelope-sender ) by mail04do.versatel.de (qmail-ldap-1.03) with SMTP for ; 16 Jan 2008 17:04:58 -0000 Received: from i59f60285.versanet.de (i59f60285.versanet.de [89.246.2.133]) by webmail.versatel.de (Horde MIME library) with HTTP; Wed, 16 Jan 2008 18:04:58 +0100 Message-ID: <20080116180458.d43jjkddpckgk4cc@webmail.versatel.de> Date: Wed, 16 Jan 2008 18:04:58 +0100 From: uwe-jannsen@versanet.de To: rsgb_lf_group@blacksheep.org References: <20080116073809.54BDCF3863@smtps02.kuleuven.be> <20080116084359.A6EEA31E703@smtps01.kuleuven.be> In-Reply-To: <20080116084359.A6EEA31E703@smtps01.kuleuven.be> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Internet Messaging Program (IMP) H3 (4.0.3) X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55 Subject: Re: LF: 500 kHz antenna Content-Type: text/plain; charset=ISO-8859-1; format="flowed" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_NAME 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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : n X-Mailer: Unknown (No Version) Hi Rik, ...................... > For the TX I would like to adapt my 137 kHz TX (G3YXM-like design) to > 500kHz. This would give me enough power to get 1 or 2 Watt ERP with a > small antenna. ...................... I use a version of G3YXM/G0MRF PA (four IRFP450) for 137kHz and 505kHz. If used on 505kHz, I have to disconnect the diodes D4 and D5 (G0MRF design). they form the 1010kHz rectangular drive signal into ?needles?. ????????. > - values for the output filter (2 or 3 stage Pi-filter) ???????? pse see http://www.uwe-jannsen-dj8wx.de/TX%20equipment.htm regards and have fun Uwe/dj8wx