Return-Path: Received: (qmail 6310 invoked from network); 15 Nov 2002 12:37:08 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 15 Nov 2002 12:37:08 -0000 Received: (qmail 14447 invoked from network); 15 Nov 2002 11:36:18 -0000 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 15 Nov 2002 11:36:17 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18Cehn-0005ij-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 15 Nov 2002 11:32:11 +0000 Received: from [130.244.199.132] (helo=fep04-svc.swip.net) by post.thorcom.com with esmtp (Exim 4.10) id 18Cehn-0005ia-00 for rsgb_lf_group@blacksheep.org; Fri, 15 Nov 2002 11:32:11 +0000 Received: from oemcomputer ([213.101.41.207]) by fep04-svc.swip.net with SMTP id <20021115113209.JXJY19843.fep04-svc.swip.net@oemcomputer> for ; Fri, 15 Nov 2002 12:32:09 +0100 Message-ID: <002901c28c9a$c4c9b1c0$ac2765d5@oemcomputer> From: "Johan Bodin" 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> <000b01c28c92$7ca50aa0$0504210a@c.scope> Date: Fri, 15 Nov 2002 12:32:26 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Re: Calibrating LF Current Meters Content-Type: multipart/mixed; boundary="------------040109040501080608040901" X-Spam-Status: No, hits=0.6 required=5.0tests=MIME_SUSPECT_NAME,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 This is a multi-part message in MIME format. --------------040109040501080608040901 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Hugh, > How have other people done it ? Any ideas ? I built a 1A antenna current meter with a current transformer. For calibration, I put a 10 ohm resistor (actually 10 x 100 ohms 1W in parallel) in series with the meter and applied RF from a 137 kHz TX until the oscilloscope reading was 28.3Vp-p. The potentiometer in the meter was then adjusted for full scale deflection. Just an example. A small drawing is attached. 73 Johan SM6LKM --------------040109040501080608040901 Content-Type: image/tiff; name="currcal.gif" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="currcal.gif" R0lGODlhjgBUAIAAAAAAAP///ywAAAAAjgBUAAAC/oyPqcvtD6OctNqLs968+w+G4kiW5omm 6sq27gvH8kzX9gLk+s73/g/83VSAW3GIOtaUyNIxCGUqpA9qM/TEWAPFrUHqvXayF6ZSV0WE xRuyxVyBs0fuuNp+WM+1X34kl7aH1Zegx/XHBchgKEjhttOgaHgW2QjymLeYCSE3ZflB1lm4 yeP5tcX4yUkIhkNKWYimqcqRpXg3Snio60hb22dFBcta5tsGPMsLlppr7Ne1WLo5NhZlfX1b vPuWl83MXLkCnjvOCn2KG34srlHXm3gbvzzczlJO6peodracXs+e4Qm2HpH4meJVBlKKewhb iIrT7wTDbS8eTvAyEVFA/hkWNaqj026gyJHjhB0UkZHjukytSKSMMbElxZmgnNF8N03mIGPZ uO2TNW2nr4wydV7i+Sud0YskCQ55efMknn82oEZt5pPqjJ5JP2bdSIMrtWT5wHK0OiWi1rIw 0EYDus7Hxa0APeg0E+xs3bFB45F14TaQXay7MKokIpbtPMNtTQCp6Q+dV3sue8JdifAyYcoo J6/Fq+8v56OezSoLunkvX9FrI6OCeQmjwq6rXDWGnAxqysBzBzug1/qrQ9+/UZtmO7yNHuDH td0OOMm4lqbSYN5LfJC3bUHYu1WvfVUo99neparTbt6SXBzRG7q02Vsw+tTwtxd3D7K+x4Ka Od/rBy/YQv8BeB8RA1bRnoEH/rZGf/4tWNBb1FEHIYLydNFdhW1lqGGHHn4IYogijkhiiSae aEIBAAA7 --------------040109040501080608040901--