Return-Path: Received: (qmail 17753 invoked from network); 6 Jul 2003 20:56:35 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 6 Jul 2003 20:56:35 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 10213 invoked from network); 6 Jul 2003 20:56:26 -0000 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 6 Jul 2003 20:56:26 -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 19ZGYD-00031p-OX for rsgb_lf_group-outgoing@blacksheep.org; Sun, 06 Jul 2003 21:56:01 +0100 Received: from [213.218.75.232] (helo=smtp03.freeler.nl) by post.thorcom.com with esmtp (Exim 4.14) id 19ZGY8-00031c-KG for rsgb_lf_group@blacksheep.org; Sun, 06 Jul 2003 21:55:56 +0100 Received: (qmail 20511 invoked from network); 6 Jul 2003 20:55:25 -0000 Received: from unknown (HELO w8k3f0.freeler.nl) ([62.21.139.156]) (envelope-sender ) by smtp03.freeler.nl (qmail-ldap-1.03) with SMTP for ; 6 Jul 2003 20:55:25 -0000 Message-ID: <5.1.0.14.0.20030706224816.02209910@POP3.freeler.nl> X-Sender: FRE0000086604@POP3.freeler.nl X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Sun, 06 Jul 2003 22:52:24 +0200 To: rsgb_lf_group@blacksheep.org From: "Dick Rollema" In-reply-to: <001c01c343d3$2e013f60$9bce28c3@captbrian> MIME-Version: 1.0 Subject: Re: LF: SAQ nil Content-Type: text/html; charset=windows-1252 X-Spam-Status: No, hits=-0.5 required=5.0tests=EMAIL_ATTRIBUTION,HTML_10_20,HTML_MESSAGE,IN_REP_TO, QUOTED_EMAIL_TEXT,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

Bryan, G3GVB wrote:


So: is the system directional ?


The gain I mentioned was in efficiency. But there may be some gain by directivity of the aerial system as well, but this is not clear.

73, Dick, PA0SE


Bryan - G3GVB  (Near Brighton )


-----Original Message-----
From: Dick Rollema <d.w.rollema@freeler.nl>
To: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
Date: 06 July 2003 13:32
Subject: Re: LF: SAQ nil


>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