Return-Path: Received: (qmail 25162 invoked from network); 18 Jun 2001 14:56:08 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 18 Jun 2001 14:56:08 -0000 Received: (qmail 29005 invoked from network); 18 Jun 2001 14:55:12 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 18 Jun 2001 14:55:12 -0000 X-Priority: 3 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15C0MN-0000FX-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 18 Jun 2001 15:50:35 +0100 X-MSMail-Priority: Normal Received: from mail.cc.kuleuven.ac.be ([134.58.10.6]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15C0MI-0000FN-00 for rsgb_lf_group@blacksheep.org; Mon, 18 Jun 2001 15:50:31 +0100 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 QAA1075290 for ; Mon, 18 Jun 2001 16:49:50 +0200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3.0.1.16.20010618155014.0bbf9ea2@mail.cc.kuleuven.ac.be> X-Sender: pb623250@mail.cc.kuleuven.ac.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Mon, 18 Jun 2001 15:50:14 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: Re: LF: Loops and steep skywaves In-reply-to: <3B2E0A3B.4081.1092E2B@localhost> References: <118.698000.285d4165@aol.com> 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: At 14:03 18/06/01 +0100, G3XDV wrote: >I remember hearing slow QSB on the transmissions of G2AJV (when I was in >GW) and GW4ALG, both at about 300km. They both used loops and I have >not heard QSB at less than 450km with Marconi antennas. I can confirm that Roger, G2AJV, had a lot of QSB while othere G's at about the same distance (but using verticals) had no QSB. But there is one thing that I never really understood : Even if a (transmitting) loop produces a lot of 'steep angle' radiation a vertical antenna (for receiving) should be rather insensitive for the incoming 'steep angle' signal. One would expect to notice the QSB only with both TX and RX side are using loops. But I could notice the QSB with a vertical as RX antenna. If the reciprocal principle works then any antenna that can receive 'steep angle' transmission should also transmit at these angles. 73, Rik ON7YD