Return-Path: Received: from mtain-mc07.r1000.mx.aol.com (mtain-mc07.r1000.mx.aol.com [172.29.96.79]) by air-dc09.mail.aol.com (v129.4) with ESMTP id MAILINDC091-86054d2f9e32255; Thu, 13 Jan 2011 19:52:02 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 86557380000CC; Thu, 13 Jan 2011 19:52:00 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PdXsd-0002XW-Bp for rs_out_1@blacksheep.org; Fri, 14 Jan 2011 00:51:03 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PdXsc-0002XN-Ou for rsgb_lf_group@blacksheep.org; Fri, 14 Jan 2011 00:51:02 +0000 Received: from nm2.bullet.mail.ird.yahoo.com ([77.238.189.59]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PdXsb-0002yv-2y for rsgb_lf_group@blacksheep.org; Fri, 14 Jan 2011 00:51:02 +0000 Received: from [77.238.189.52] by nm2.bullet.mail.ird.yahoo.com with NNFMP; 14 Jan 2011 00:50:55 -0000 Received: from [212.82.108.240] by tm5.bullet.mail.ird.yahoo.com with NNFMP; 14 Jan 2011 00:50:55 -0000 Received: from [127.0.0.1] by omp1005.mail.ird.yahoo.com with NNFMP; 14 Jan 2011 00:50:55 -0000 X-Yahoo-Newman-Id: 311805.47234.bm@omp1005.mail.ird.yahoo.com Received: (qmail 22891 invoked from network); 14 Jan 2011 00:50:55 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=IK/R+zc/rag/VA/pF/hyh9IKrwdcTb+BiAJA4TQsw5SlaesYdb2NxNfXZgk9EGMg2NUY0LhISxFFsf2SMXLPNAR8i0C7A7C+yx6pyQpKHf1dRrbYQ4pD9ywbk6D+jdL2gjM8Xkcb0hbJ01ehWrsHliN1A1kF2rto6U1i2F5DGbs= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1294966255; bh=JdTFrBUICyPJFGM61xyVvQ5OSa28RWKplvMQOTdwJHw=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=EluwKn+TWnjXxatBcaX2l4zwmRbVrLkfleZOLhSsbqyG41IxN5uWNSHJh412o+KC101ze++EKkq03ITiTtCMdn2W1yWTTeNE6SVgnlNJ9QLi/tgXp25jQh8KMLsbrt5WhSSQJRjQ6pz05QqtR2I/v/F2slWisjbEvDAHFqZ9NW8= Received: from JimPC (james.moritz@86.183.216.154 with login) by smtp821.mail.ird.yahoo.com with SMTP; 14 Jan 2011 00:50:51 +0000 GMT X-Yahoo-SMTP: Cxhli3eswBD1ozmtAojhjrja86kWx0Qm9tycD5QR1DKWrOLgjJcXkw-- X-YMail-OSG: vAPM3bYVM1muUP1GqKwmbjHpFB0wfSsHVBdMQXXi9qI2hJC huou8RPoqikmWh7x3SSXEH16q0f_BD0LX8.TYFHVdFJRsbaYPBe3wsQdlrhK .DTmzqKqEEhaaiv1sR7f0YKIE7pf6ALmO40UMFXuCVHs9s0Cz4UvbPcKEtI6 epzbM8xAqjxlSZNrO_NhbHsqCu5yBnB1YARIvFEbBDSyKRXRWOZwGSy.zits fxeaPhM2WQSX7FSP9VHS7krI4hS6fus9ZQeTS8x8MJSPW4JMC.zHQ9OXSmVi y8Y8.1Q-- X-Yahoo-Newman-Property: ymail-3 Message-ID: <9420C73819424D74866D2776D5C97AB5@JimPC> From: "James Moritz" To: References: <003801cbb33e$8b59e620$0401a8c0@xphd97xgq27nyf> <004001cbb349$8b4ec190$0401a8c0@xphd97xgq27nyf> <4D2F705F.7020804@iup.uni-heidelberg.de> In-Reply-To: Date: Fri, 14 Jan 2011 00:50:51 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18416 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18483 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: LF: Re: FET RDS Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original 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=0.1 required=5.0 tests=MISSING_OUTLOOK_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-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d224.2 ; domain : btopenworld.com DKIM : fail x-aol-sid: 3039ac1d604f4d2f9e307a80 X-AOL-IP: 195.171.43.25 Dear Chris, Stefan, LF Group, The high current ranges on DMMs often have considerably poorer accuracy than the DC volts ranges. Another source of power measurement error is the dummy load; both its actual resistance value at the operating frequency, and, with high RF powers, the change in resistance due to temperature rise will cause changes in RF output and/or measurement errors. I have an old Bird 1kW load that appears to change resistance by a few percent when running at maximum rating. Cheers, Jim Moritz 73 de M0BMU