Return-Path: Received: (qmail 605 invoked from network); 31 Mar 2003 17:43:30 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 31 Mar 2003 17:43:30 -0000 Received: (qmail 16126 invoked from network); 31 Mar 2003 17:43:32 -0000 Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 31 Mar 2003 17:43:32 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1903Fv-0006Re-Pe for rsgb_lf_group-outgoing@blacksheep.org; Mon, 31 Mar 2003 18:39:35 +0100 Received: from [62.253.164.47] (helo=mta7-svc.business.ntl.com) by post.thorcom.com with esmtp (Exim 4.14) id 1903Fm-0006RV-EH for rsgb_lf_group@blacksheep.org; Mon, 31 Mar 2003 18:39:26 +0100 Received: from l8p8y6 ([62.252.232.30]) by mta7-svc.business.ntl.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with SMTP id <20030331173925.BFRV27609.mta7-svc.business.ntl.com@l8p8y6> for ; Mon, 31 Mar 2003 18:39:25 +0100 Message-ID: <000c01c2f7a4$0453e760$1ee8fc3e@l8p8y6> From: "hamilton mal" To: rsgb_lf_group@blacksheep.org Date: Mon, 31 Mar 2003 17:38:23 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: GAIN Content-Type: text/html; charset=windows-1252 X-Spam-Status: No, hits=1.2 required=5.0tests=HTML_20_30,HTML_MESSAGEversion=2.51 X-Spam-Level: * X-Spam-Checker-Version: SpamAssassin 2.51 (1.174.2.5-2003-03-20-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

I measured the gain today between my 90 metre perimiter vertical loop resonated on 137 khz and my vertical system. The vertical has a 20 db gain over the loop measuring the noise floor. Using the Decca RF pre amp with the loop gets close to the vertical performance but with the disadvantage of being only bi-directional. Measuring a signal above the NF indicates the same 20 db gain by the vertical. The band is quiet with no environmental or locally generated noise problems.

The vertical is way ahead of the loop at this QTH. The loop is not worth considering as a TX antenna given the above results.

This recent test confirms previous observations.

73 de Mal/G3KEV