Return-Path: Received: (qmail 3585 invoked from network); 2 Apr 2000 11:08:38 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by redlabel.core.plus.net.uk with SMTP; 2 Apr 2000 11:08:38 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12bi9T-0006uC-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 02 Apr 2000 12:02:43 +0100 Received: from mb09.swip.net ([193.12.122.212]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12bi9L-0006sf-00 for rsgb_lf_group@blacksheep.org; Sun, 02 Apr 2000 12:02:35 +0100 Received: from win95 (d212-151-57-96.swipnet.se [212.151.57.96]) by mb09.swip.net (8.8.8/8.8.8) with SMTP id NAA07338 for ; Sun, 2 Apr 2000 13:02:08 +0200 (MET DST) Message-ID: <000b01bf9c93$532ac260$603997d4@win95.swipnet.se> From: "C Andersson" To: "RSGB LF group" Subject: LF: New FS measurements Date: Sun, 2 Apr 2000 13:05:13 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hello LF group, I just want to share my last findings in the chase of "the missing dB's". Yesterday I changed the antenna ground plane and added 10x6 m chicken wire around the antenna base plus 12 radials 20-25 m each. The chicken wire was solderable with a 300W soldering iron. The feed impedance went down from 25 to 22 ohm. Not very much difference. I have not used radials before, just a 8 m steel pipe + a various other ground connections in parallel. Today's measurements however show a noticeable improvement of 1,6-2 dB (with the same antenna current). Now, after all, the estimated ERP seems to correspond with measured values. Interesting that the ground plane in some way improves the far field signal. (BTW, the cost/improvement factor is 400 SEK/dB + 5 working hours. (400SEK=46 USD)) More details on my home page: http://home5.swipnet.se/~w-54761/fs.htm 73 Christer sm6pxj