Return-Path: Received: (qmail 15717 invoked from network); 31 Jan 2001 15:26:53 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 31 Jan 2001 15:26:53 -0000 Received: (qmail 7878 invoked from network); 31 Jan 2001 15:20:58 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 31 Jan 2001 15:20:58 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14NyrB-0004xm-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 31 Jan 2001 15:07:37 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from mail.cc.kuleuven.ac.be ([134.58.10.6]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14Nyr8-0004xf-00 for rsgb_lf_group@blacksheep.org; Wed, 31 Jan 2001 15:07:36 +0000 Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mail.cc.kuleuven.ac.be (8.9.3/8.9.0) with SMTP id QAA60262 for ; Wed, 31 Jan 2001 16:06:57 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3.0.1.16.20010131165750.2c4f3892@mail.cc.kuleuven.ac.be> X-Sender: pb623250@mail.cc.kuleuven.ac.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Wed, 31 Jan 2001 16:57:50 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: LF: Noise at night In-reply-to: <3A77DECE.29800.1FB248@localhost> References: <4.1.20010130222200.00bd08c0@pop.tiscalinet.it> <3A768E17.10488.252F00@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: If a significant part of the nighttime QRN/QRM is realy coming from the east then a directional receiving antenna should be considered. Two small loops spaced 1/8 wavelength (275m) and fed with 90 degrees phase difference give a 15dB F/B ratio while having a rather wide opening angle (enough to cover most of VE/W from Europe). This would bring eastbound QRM/QRN 2/3 s-points down. Spacing could be reduced at expence of the F/B ratio (abt 5dB at 100m spacing). Some years ago I have written a small turbo pascal program that simulates the radiation pattern of 2 loops or verticals (or combination of both). Initial goal was to see if a small directional receiving antenna could be made for 80/40m. If there is some interest I will se if I can adapt it for longwave. 73, Rik ON7YD