X-GM-THRID: 1209154499453586391 X-Gmail-Labels: rsgb lf X-Gmail-Received: 35e7be97336d38d7ca5b32f67c7285b303eb074f Delivered-To: daveyxm@gmail.com Received: by 10.64.243.13 with SMTP id q13cs114059qbh; Mon, 17 Jul 2006 05:33:11 -0700 (PDT) Received: by 10.49.1.9 with SMTP id d9mr1912547nfi; Mon, 17 Jul 2006 05:33:10 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id k24si1672709nfc.2006.07.17.05.33.10; Mon, 17 Jul 2006 05:33:10 -0700 (PDT) Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1G2SDi-0000LR-R0 for rs_out_1@blacksheep.org; Mon, 17 Jul 2006 13:29:06 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1G2SDi-0000LI-5e for rsgb_lf_group@blacksheep.org; Mon, 17 Jul 2006 13:29:06 +0100 Received: from hestia.herts.ac.uk ([147.197.200.9]) by relay2.thorcom.net with esmtp (Exim 4.51) id 1G2SDd-0005Lv-1F for rsgb_lf_group@blacksheep.org; Mon, 17 Jul 2006 13:29:05 +0100 Received: from [147.197.215.113] (helo=tucana.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 1G2S9v-00008v-00 for rsgb_lf_group@blacksheep.org; Mon, 17 Jul 2006 13:25:11 +0100 Received: from [147.197.164.230] (helo=RD40002) by tucana.herts.ac.uk with esmtp (Exim 4.44) id 1G2S9p-00026a-7i for rsgb_lf_group@blacksheep.org; Mon, 17 Jul 2006 13:25:05 +0100 From: "james moritz" To: Date: Mon, 17 Jul 2006 13:25:04 +0100 Message-ID: <000001c6a99c$0848d120$e6a4c593@RD40002> MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: <010701c6a931$73f5d460$6501a8c0@eagles> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 X-UH-MailScanner: No Virus detected X-UH-MailScanner-Information: X-H-UH-MailScanner: No Virus detected X-UH-MailScanner-From: j.r.moritz@herts.ac.uk X-Spam-Score: -0.6 (/) X-Spam-Report: autolearn=disabled,AWL=-0.566 Subject: LF: RE: DFCW, power and time. Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 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 Status: O X-Status: X-Keywords: X-UID: 4892 Dear J, LF Group, You wrote: ...I have an RF ammeter which shows almost no antenna base current from = 100=20 Watt transmitter output. To get the 2.85 Amps will require much more = power.=20 I guesstimated about 410 Watts... Going from 100W to 410W will produce just over double the antenna = current, so unless "almost no antenna base current" is about 1.4A, the power = increase will not in itself achieve your goal. If we assume for a moment that the resistive part of the impedance of your antenna is in the range 25ohms - 100ohms, and the antenna tuner is reasonably efficient, the antenna = current should be in the range of about 1A - 2A with 100W TX. Being a big = antenna, one would expect it to be towards the upper end of this range.=20 So unless the antenna current you are seeing is 1A or over, it looks = like your antenna tuner is still not working properly. Most of the TX power = is being dissipated somewhere other than the antenna, probably in the tuner components. A large increase in TX power will cause these components to = get a lot hotter, probably damaging them. So it is important to sort this problem out before increasing the TX power. Cheers, Jim Moritz 73 de M0BMU