Return-Path: Received: (qmail 73138 invoked from network); 27 Dec 2003 14:11:15 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore02.plus.net with SMTP; 27 Dec 2003 14:11:15 -0000 Received: (qmail 96717 invoked from network); 27 Dec 2003 14:11:14 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Priority: 3 X-MSMail-Priority: Normal X-Spam-detection-level: 11 Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 27 Dec 2003 14:11:11 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1AaF9q-000Odc-Rg for dave@picks.force9.co.uk; Sat, 27 Dec 2003 14:11:10 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AaF9X-0006LE-QJ for rs_out@blacksheep.org; Sat, 27 Dec 2003 14:10:51 +0000 Received: from [213.218.75.236] (helo=smtp07.freeler.nl) by post.thorcom.com with esmtp (Exim 4.14) id 1AaF9W-0006L5-Vs for rsgb_lf_group@blacksheep.org; Sat, 27 Dec 2003 14:10:51 +0000 Received: (qmail 24142 invoked from network); 27 Dec 2003 14:10:50 -0000 X-Fake-Domain: unknown Received: from unknown (HELO w8k3f0.freeler.nl) ([62.21.147.78]) (envelope-sender ) by smtp07.freeler.nl (qmail-ldap-1.03) with SMTP for ; 27 Dec 2003 14:10:49 -0000 Message-ID: <6.0.1.1.2.20031227144750.035a8d70@POP3.freeler.nl> X-Sender: FRE0000086604@POP3.freeler.nl (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 6.0.1.1 Date: Sat, 27 Dec 2003 15:09:07 +0100 To: "LF-Group" From: "Dick Rollema" MIME-Version: 1.0 Subject: LF: "T" versus "L"aerial Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.1 required=5.0 tests=HTML_FONT_BIG,HTML_MESSAGE autolearn=no version=2.60 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: rs_out@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 1 Content-transfer-encoding: 8bit To All from PA0SE

Further to my e-mail of 26 December I measured the field strength as radiated by the aerial in
Inverted L-configuration. From this I found EMRP = 57 milliwatt.

This confirms the benificial effect of top loading. The T-aerial radiated 140 milliwatt.

So going from a single 20m top load wire for the "L" to 2 x 20m for the "T" resulted in an improvement by a factor 2.46 (3.9dB) in radiated power.

The vertical part of the "T" consisted of an open wire feedline of 11m with the two wires connected in parallel in the attic shack. For the "L" one of the feedline wires was removed. I assume this did not appreciably affect the EMRP.

73, Dick, PA0SE