Return-Path: Received: from rly-md07.mx.aol.com (rly-md07.mail.aol.com [172.20.29.145]) by air-md05.mail.aol.com (v123.4) with ESMTP id MAILINMD052-9184a0da2c6220; Fri, 15 May 2009 13:14:48 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-md07.mx.aol.com (v123.4) with ESMTP id MAILRELAYINMD078-9184a0da2c6220; Fri, 15 May 2009 13:13:43 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1M50xf-0007xD-Iu for rs_out_1@blacksheep.org; Fri, 15 May 2009 18:12:43 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1M50xf-0007x4-5W for rsgb_lf_group@blacksheep.org; Fri, 15 May 2009 18:12:43 +0100 Received: from ttsmtp-2.cpwnetworks.com ([62.24.128.243] helo=ttsmtp.cpwnetworks.com) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1M50xd-0003jX-2O for rsgb_lf_group@blacksheep.org; Fri, 15 May 2009 18:12:43 +0100 X-Path: TalkTalk-smtp X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ArUEAMc+DUpZ8IaW/2dsb2JhbACET8w0gkKBPwU Received: from unknown (HELO mal769a60aa920) ([89.240.134.150]) by ttsmtp.cpwnetworks.com with SMTP; 15 May 2009 18:11:33 +0100 Message-ID: <005301c9d580$32b8ecc0$0301a8c0@mal769a60aa920> From: "mal hamilton" To: References: <4A0D91E3.9040602@btconnect.com> Date: Fri, 15 May 2009 18:11:33 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: Aerial current 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=0.0 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 X-AOL-IP: 193.82.116.20 Richard. A couple of basic points. Check the TX output into a 50 ohm DL via a SWR meter to verify a match, and if necessary check rf current. Resonate the antenna to the reqd freq and with your atu match it to50 ohms. If both are spot on then you have achieved the object, at least you have a bench mark. If coax is suspect check it also. g3kev ----- Original Message ----- From: "Richard Newstead" To: Sent: Friday, May 15, 2009 5:01 PM Subject: LF: Aerial current > After my success in getting more current into the aerial yesterday I > decided to measure the RF current in the link (link coupled ATU) with a > proper RF ammeter. I was somewhat surprised that the current pinned my 1 > Amp RF meter. How can that be? I can think of some possible reasons: > > 1) The meter is wrong (it must be nearly 70 years old) > 2) The impedance is not 50 Ohms which is odd because I assume the TX is > designed to have a 50 Ohm output and I carefully adjusted the link for > maximum power transfer last night). > 3) The transmitter is giving out far more power than expected (seems > unlikely). > > Any ideas? > > Incidentally, am I best to measure current in the link or in the aerail > wire? > > 73 > > Richard > > PS - beacon on again 501.6kHz. > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.329 / Virus Database: 270.12.30/2115 - Release Date: 05/14/09 17:54:00