Return-Path: Received: from rly-dg08.mx.aol.com (rly-dg08.mail.aol.com [172.19.151.92]) by air-dg08.mail.aol.com (v121_r4.6) with ESMTP id MAILINDG082-5e94946d10a3e7; Mon, 15 Dec 2008 16:50:20 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dg08.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDG088-5e94946d10a3e7; Mon, 15 Dec 2008 16:50:04 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LCLJn-00087U-Ng for rs_out_1@blacksheep.org; Mon, 15 Dec 2008 21:49:35 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LCLJm-00087L-TX for rsgb_lf_group@blacksheep.org; Mon, 15 Dec 2008 21:49:34 +0000 Received: from sighthound.demon.co.uk ([80.177.174.126]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LCLJm-0002Vq-7b for rsgb_lf_group@blacksheep.org; Mon, 15 Dec 2008 21:49:34 +0000 Received: from lurcher.twatt.local (lurcher.twatt.local [10.0.0.8]) by rsync.twatt.local (Postfix) with ESMTP id C14CE3B847 for ; Mon, 15 Dec 2008 21:49:25 +0000 (GMT) Date: Mon, 15 Dec 2008 21:49:25 +0000 From: John P-G To: rsgb_lf_group@blacksheep.org Message-ID: <20081215214925.6ea23758@lurcher.twatt.local> In-Reply-To: <20081215214048.ycybajir85s84kcw@webmail4.kuleuven.be> References: <002901c95e97$87b3f400$0301a8c0@mal769a60aa920> <004001c95ea5$b34c32e0$8d01a8c0@JAYDELL> <006601c95ea8$c07ffde0$0301a8c0@mal769a60aa920> <57a24ca70812150800w249cb152wf212a2566f607fb0@mail.gmail.com> <009001c95ed1$feba2e40$0301a8c0@mal769a60aa920> <20081215164355.8DCA5F3862@smtps02.kuleuven.be> <00b201c95ee2$813c91e0$0301a8c0@mal769a60aa920> <20081215214048.ycybajir85s84kcw@webmail4.kuleuven.be> X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.11; i686-pc-linux-gnu) Mime-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: Re: 500/137 XBAND QSO Content-Type: text/plain; charset=US-ASCII 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=0.0 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-IP: 193.82.116.20 On Mon, 15 Dec 2008 21:40:48 +0100 Rik Strobbe wrote: > > 1/4 wave inv L at over 100 ft high. > The radiation resistance of this antenna must be about 5 Ohm, with a > loss resistance of 20 Ohm the efficiency is 25%. So I guess a TX power no greater than 4W would be sufficient to meet the 1W ERP limit? A super efficient, optimally tuned Class-E single-FET amplifier capable of the necessary power would indeed fit in your pocket. However, we still wait for some technical details of this super QRP DX transmitter.... and wait.... and wait.... Like the man himself said "What some claim and what they do is a different thing, do not believe everything you hear." John GM4SLV