Return-Path: Received: (qmail 500 invoked from network); 15 Nov 2002 11:12:08 -0000 Received: from mx.last.plus.net (212.159.3.230) by mailstore with SMTP; 15 Nov 2002 11:12:08 -0000 Received: (qmail 23640 invoked from network); 15 Nov 2002 10:31:17 -0000 Received: from post.thorcom.com (193.82.116.70) by mx.last.plus.net with SMTP; 15 Nov 2002 10:31:17 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18Cdqx-0005YK-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 15 Nov 2002 10:37:35 +0000 Received: from [212.159.14.223] (helo=marstons.services.quay.plus.net) by post.thorcom.com with smtp (Exim 4.10) id 18Cdqx-0005YB-00 for rsgb_lf_group@blacksheep.org; Fri, 15 Nov 2002 10:37:35 +0000 Received: (qmail 3168 invoked by uid 10001); 15 Nov 2002 10:37:02 -0000 Received: from unknown (HELO hugh) (212.159.90.113) by marstons.services.quay.plus.net with SMTP; 15 Nov 2002 10:37:02 -0000 Message-ID: <000b01c28c92$7ca50aa0$0504210a@c.scope> From: "g6tmk" To: rsgb_lf_group@blacksheep.org References: <3DD35969.30941.58250D@localhost> <004801c28bb7$b2c00580$015e89d9@jackie> <5.1.0.14.0.20021114135046.02a5e660@pb623250.kuleuven.be> Date: Fri, 15 Nov 2002 10:33:43 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Calibrating LF Current Meters Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=0.5 required=5.0tests=REFERENCES,SPAM_PHRASE_00_01,USER_AGENT_OEversion=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Hi All, I built the little antenna current meter shown in the LF Experimenters Handbook last night (Page 81). And it works. I measured the current from my HF rig into a dummy load at 1.8MHz, and it gave sensible results ... But how can I calibrate it - how do I know that an indicated Amp really is an Amp. My DVMs, being intended for mains current measurement, don't have the frequency response. How have other people done it ? Any ideas ? 73 Hugh M0WYE