Return-Path: Received: (qmail 27269 invoked from network); 6 Jul 2003 12:30:45 -0000 Received: from marstons.services.quay.plus.net (212.159.14.223) by mailstore with SMTP; 6 Jul 2003 12:30:45 -0000 Received: (qmail 26051 invoked by uid 10001); 6 Jul 2003 12:30:44 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 6 Jul 2003 12:30:44 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.14) id 19Z8eP-0000JM-L9 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 06 Jul 2003 13:29:53 +0100 Received: from [213.218.75.233] (helo=smtp04.freeler.nl) by post.thorcom.com with esmtp (Exim 4.14) id 19Z8eK-0000JC-HX for rsgb_lf_group@blacksheep.org; Sun, 06 Jul 2003 13:29:48 +0100 Received: (qmail 13912 invoked from network); 6 Jul 2003 12:29:17 -0000 Received: from unknown (HELO w8k3f0.freeler.nl) ([62.21.150.130]) (envelope-sender ) by smtp04.freeler.nl (qmail-ldap-1.03) with SMTP for ; 6 Jul 2003 12:29:17 -0000 Message-ID: <5.1.0.14.0.20030706135720.02d3c6c0@POP3.freeler.nl> X-Sender: FRE0000086604@POP3.freeler.nl X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Sun, 06 Jul 2003 14:15:08 +0200 To: rsgb_lf_group@blacksheep.org From: "Dick Rollema" In-reply-to: <3F07FA9A.6020308@usa.net> References: <5.1.0.14.0.20030628173442.02a8c008@gemini.herts.ac.uk> <200306302008.50327.valerio@dii.unisi.it> <3F00AA90.3090201@usa.net> <200307021553.14759.valerio@dii.unisi.it> MIME-Version: 1.0 Subject: Re: LF: SAQ nil Content-Type: text/html; charset=windows-1252 X-Spam-Status: No, hits=-0.2 required=5.0tests=EMAIL_ATTRIBUTION,HTML_10_20,HTML_FONT_FACE_ODD, HTML_MESSAGE,IN_REP_TO,REFERENCES,REPLY_WITH_QUOTESversion=2.55 X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp) X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Content-transfer-encoding: 8bit To All from PA0SE

valerio gabbani wrote:

Alberto, Thanks for the info, did you know also the antenna system used ? '73, Valerio IK5ZPV

You can find info (in Swedish) on the Grimeton station SAQ, including a photograph of the antenna system, at the following URL:

www.alexander.n.se

The antenna consists of six 127m high vertical top fed radiators in line, each with its own earth tuning coil and earth electrode. This decreases the earth loss because each earth electrode carries a current I/N, in which I is the total earth current and N the number of radiators = number of earth electrodes. The gain results from the fact that the total earth loss is N times the loss around each electrode but the loss at each electrode decreases at (I/N) squared. The system was invented by Alexanderson, also designer of the alternator used at Grimeton.

73, Dick, PA0SE