Return-Path: Received: (qmail 38512 invoked from network); 3 Nov 2004 09:52:29 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 3 Nov 2004 09:52:29 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CPI3m-0000cQ-NH for dave@picks.force9.co.uk; Wed, 03 Nov 2004 10:08:11 +0000 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CPI3m-0000cI-C6 for dave@picks.force9.co.uk; Wed, 03 Nov 2004 10:08:10 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1CPHoa-000Kwk-DN for dave@picks.force9.co.uk; Wed, 03 Nov 2004 09:52:28 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CPHnu-0001aC-Pq for rs_out_1@blacksheep.org; Wed, 03 Nov 2004 09:51:46 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CPHnu-0001a3-Er for rsgb_lf_group@blacksheep.org; Wed, 03 Nov 2004 09:51:46 +0000 Received: from mta03-svc.ntlworld.com ([62.253.162.43]) by relay.thorcom.net with esmtp (Exim 4.41) id 1CPHnm-00078Z-Am for rsgb_lf_group@blacksheep.org; Wed, 03 Nov 2004 09:51:46 +0000 Received: from mikedennison ([80.4.116.83]) by mta03-svc.ntlworld.com (InterMail vM.4.01.03.37 201-229-121-137-20020806) with ESMTP id <20041103094941.RRNI25095.mta03-svc.ntlworld.com@mikedennison> for ; Wed, 3 Nov 2004 09:49:41 +0000 From: "Mike Dennison" To: rsgb_lf_group@blacksheep.org Date: Wed, 03 Nov 2004 09:51:39 -0000 MIME-Version: 1.0 Message-ID: <4188AA2B.21796.2CA200@localhost> In-reply-to: <002a01c4c110$b7e9b200$0702a8c0@parissn2> X-mailer: Pegasus Mail for Windows (v4.12a) Content-description: Mail message body X-SPF-Result: relay.thorcom.net: domain of ntlworld.com designates 62.253.162.43 as permitted sender X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=no,RCVD_IN_SORBS=0.1 Subject: Re: LF: Rugby Loran station Content-type: text/plain; charset=US-ASCII; 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=0.0 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) On 2 Nov 2004 at 20:18, Stewart Nelson wrote: > Not true. For example, if you have a 100 watt CW transmitter > with the key held down, the carrier power is 100 watts. > Now, what happens when you send a string of dots (50% duty)? > Your total power out is indeed 50 watts, but only 25 watts > is in the carrier; the other half is in the keying sidebands > (if ideal envelope shaping). In general, the carrier power > is multiplied by the square of the duty cycle. But doesn't the lost power depend on the Morse speed? Are you saying that for a dot lasting an hour, 50% of the total key down power is taken up by the few milliseconds at key up/down? Mike, G3XDV ==========