Return-Path: X-Spam-DCC: paranoid 1233; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t9JGo0bA028161 for ; Mon, 19 Oct 2015 18:50:00 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZoDa3-0007mH-EB for rs_out_1@blacksheep.org; Mon, 19 Oct 2015 17:46:39 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZoDa3-0007m8-5N for rsgb_lf_group@blacksheep.org; Mon, 19 Oct 2015 17:46:39 +0100 Received: from mail-wi0-f182.google.com ([209.85.212.182]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1ZoDZ1-0001t3-Qo for rsgb_lf_group@blacksheep.org; Mon, 19 Oct 2015 17:46:37 +0100 Received: by wikq8 with SMTP id q8so14459672wik.1 for ; Mon, 19 Oct 2015 09:45:19 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=content-type:mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=zO5y+oCSwN4j0O5XtmfdtvXBiXZsHvZswIB0cVoijSM=; b=X3/7RN2wzKd/AY7O06ZGrA949n0ovf+lv6jeVs4eI8OEYujP3mF30jWaHQcOvTdyrA PKpggOmtiPcC+XE1yBDCWPyNPcQc7ExM9dxj+E7+zwJnmxD+I6rrG5kRZATC8nCysr7T niNXCdFoEtUs7MT/STKfRnCMnJfPiEEh0t5OdK1BShqSZUrqFt3HDOeTObWIg2/rWJpK O3H09u0CS7bX3BIV3MG0U8rDj3yWOnWZXLE3ybKJOY901w5qoC7E0Zgnr7KpXwI5pu2c HY3RXzm0Dl4nX6vzz8AGhavIpECO4iX74NMsJisGBlHjCQrv0FRnAb1fsCV2DQj0ydqn q1/Q== X-Received: by 10.180.104.6 with SMTP id ga6mr23084504wib.46.1445273119162; Mon, 19 Oct 2015 09:45:19 -0700 (PDT) Received: from [192.168.1.101] ([82.98.23.94]) by smtp.gmail.com with ESMTPSA id l1sm41192868wjx.13.2015.10.19.09.45.17 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 19 Oct 2015 09:45:17 -0700 (PDT) Mime-Version: 1.0 (Mac OS X Mail 9.0 \(3094\)) From: John Rabson X-Priority: 3 (Normal) In-Reply-To: <1435044716.20151018182802@chriswilson.tv> Date: Mon, 19 Oct 2015 18:45:16 +0200 Message-Id: References: <1435044716.20151018182802@chriswilson.tv> To: rsgb_lf_group@blacksheep.org X-Mailer: Apple Mail (2.3094) X-Scan-Signature: 64437c466041e93ffedda7fb96b22b71 Content-Type: text/plain; charset=us-ascii Subject: Re: LF: Where to measure antenna current? 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id t9JGo0bA028161 Status: O X-Status: X-Keywords: X-UID: 4522 Chris, The arrangement I have here comprises a 5A FSD RF ammeter between the transmitter and the antenna isolating transformer, and another such ammeter (switchable between 5A and 500mA FSD) between the isolating transformer and the earthy end of the antenna matching network.. The intended impedance at this point is 50 ohms. Hope this helps, John > On 18 Oct 2015, at 19:28, Chris Wilson wrote: > > 18 October 2015 > > > I have a Scopematch box in circuit between LF amplifier and feeder > co-ax, inside the shack. Does the current waveform simulate the same > thing as a current meter? Or should a current meter be placed on the > actual aerial wire itself, high voltages be damned? Thanks. > > > > -- > > > Best regards, > Chris mailto:chris@chriswilson.tv > > john.rabson07@gmail.com Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE