Return-Path: X-Spam-DCC: paranoid 1117; 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 t9UKhJx6010566 for ; Fri, 30 Oct 2015 21:43:20 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZsGTR-0001WP-No for rs_out_1@blacksheep.org; Fri, 30 Oct 2015 20:40:33 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZsGTR-0001WG-G2 for rsgb_lf_group@blacksheep.org; Fri, 30 Oct 2015 20:40:33 +0000 Received: from know-smtprelay-omc-11.server.virginmedia.net ([80.0.253.75]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ZsGSN-0008Fo-8J for rsgb_lf_group@blacksheep.org; Fri, 30 Oct 2015 20:40:32 +0000 Received: from [192.168.1.6] ([86.31.33.210]) by know-smtprelay-11-imp with bizsmtp id bYf91r00M4Y1DuW01YfBiN; Fri, 30 Oct 2015 20:39:11 +0000 X-Originating-IP: [86.31.33.210] X-Spam: 0 X-Authority: v=2.1 cv=dtgmcAU4 c=1 sm=1 tr=0 a=jn/JOh/JfiX48zzdjRLp/g==:117 a=jn/JOh/JfiX48zzdjRLp/g==:17 a=NLZqzBF-AAAA:8 a=kj9zAlcOel0A:10 a=PaHEi9XbAAAA:8 a=oCcaPWc0AAAA:8 a=ubgJUPTX1JUQtcLTZ-EA:9 a=CjuIK1q_8ugA:10 a=-FEs8UIgK8oA:10 a=NWVoK91CQyQA:10 From: "Mike Dennison" To: rsgb_lf_group@blacksheep.org Date: Fri, 30 Oct 2015 20:39:08 -0000 MIME-Version: 1.0 Message-ID: <5633D56C.20659.23BE4D8@mike.dennison.ntlworld.com> In-reply-to: <5633B50A.5030903@posteo.de> References: <1887849276.20151030143118@chriswilson.tv>, <5633B50A.5030903@posteo.de> X-mailer: Pegasus Mail for Windows (4.41) Content-description: Mail message body X-Scan-Signature: a6b6ffaf48fdddf1ed5c25dc4bf03ee1 Subject: Re: LF: Zmag of 45.6 Ohms OK, or should I try for better? Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT 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 Status: O X-Status: X-Keywords: X-UID: 4711 I agree with Stefan. A transformer (using a suitable core material such as 3C90) gives you more flexibility in the future It also provides the opportunity to isolate the RF ground from the mains supply ground which can improve EMC both on transmit and receive. Well done so far. Your signal is very impressive with such low RF power. Mike, G3XDV ========== > I would use an isolating transformer even if Z would be R = 50 Ohm. > Also this allows you to improve the ground further :-) > > 73, Stefan > > Am 30.10.2015 15:31, schrieb Chris Wilson: > > 30 October 2015 > > > > > > I now have my loading coil running without a matching transformer, > > as I have very slightly improved my ground. I get a Zmag of 45.6 > > Ohms, is it worth worrying about? Thanks, a scan is at: > > > > > > http://www.chriswilson.tv/30-10-2015.jpg > > > > > > > > > > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2016.0.7163 / Virus Database: 4457/10915 - Release Date: > 10/30/15 >