Return-Path: Received: (qmail 10090 invoked from network); 19 May 1999 21:30:36 +0100 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by guiness.force9.net with SMTP; 19 May 1999 21:30:36 +0100 Received: (qmail 20228 invoked from network); 19 May 1999 20:33:28 -0000 Received: from punt.unica.co.uk (194.75.183.60) by magnus.plus.net.uk with SMTP; 19 May 1999 20:33:28 -0000 Received: from troy.blacksheep.org ([194.75.183.50] ident=root) by punt.unica.co.uk with esmtp (Exim 2.00 #2) id 10kCyL-0001vP-00; Wed, 19 May 1999 21:29:49 +0100 Received: (from root@localhost) by troy.blacksheep.org (8.6.12/8.6.12) id UAA09489 for rsgb_lf_group-outgoing; Wed, 19 May 1999 20:28:44 GMT Received: from post.thorcom.com (root@post.unica.co.uk [194.75.183.70]) by troy.blacksheep.org (8.6.12/8.6.12) with ESMTP id UAA09485 for ; Wed, 19 May 1999 20:28:39 GMT Received: from mta.xtra.co.nz ([203.96.92.1] helo=mta1-rme.xtra.co.nz) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10kDBJ-0004BR-00 for rsgb_lf_group@blacksheep.org; Wed, 19 May 1999 21:43:13 +0100 Received: from locxvcym ([203.96.101.160]) by mta1-rme.xtra.co.nz (InterMail v04.00.02.07 201-227-108) with ESMTP id <19990519202947.BKMB7869945.mta1-rme@locxvcym> for ; Thu, 20 May 1999 08:29:47 +1200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 From: "ComPact" To: rsgb_lf_group@blacksheep.org Subject: LF: Re: "RF Design" magazine article Date: Thu, 20 May 1999 08:29:10 +1200 X-MSMail-Priority: Normal X-Priority: 3 X-Mailer: Microsoft Internet Mail 4.70.1161 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Message-ID: <19990519202947.BKMB7869945.mta1-rme@locxvcym> Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Good morning from ZL where the QRN is reducing as winter approaches. Walter G3JKV mentioned the RF Design article on low power LF propagation. Nat ZL3VN and myself have regular QSOs using backyard sized antennas and QRP over a 300km (mostly sea) path on 181.4kHz. We find that 1 watt transmitter output is sufficient for R5 regular CW most of the time. Dropping to 0.5 watts output makes readability marginal. However, the signals are regular CW in a 500 hz bandwidth so there is certainly scope for extending the distance or reducing the power greatly. Mike ZL4OL