Return-Path: Received: (qmail 23136 invoked from network); 17 Dec 2001 20:16:21 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 17 Dec 2001 20:16:21 -0000 Received: (qmail 10463 invoked from network); 17 Dec 2001 20:16:27 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 17 Dec 2001 20:16:27 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16G44t-0007OQ-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 17 Dec 2001 20:09:35 +0000 Received: from tvrelay.mail.uk.easynet.net ([194.6.96.11]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16G44r-0007OL-00 for rsgb_lf_group@blacksheep.org; Mon, 17 Dec 2001 20:09:34 +0000 Received: from ericadodd (tnt-18-427.easynet.co.uk [212.134.225.171]) by tvrelay.mail.uk.easynet.net (Postfix) with SMTP id B343C66EE1 for ; Mon, 17 Dec 2001 20:08:41 +0000 (GMT) Message-ID: <000401c18737$3449fe20$abe186d4@ericadodd> From: "g3ldo" To: rsgb_lf_group@blacksheep.org References: <001501c18685$c72752e0$1f9b883e@g3aqc> <001601c1868a$9d1b37a0$0300a8c0@charter.net> <000301c18695$d3c90420$0300a8c0@charter.net> Subject: LF: 73kHz propagation monitoring Date: Mon, 17 Dec 2001 20:12:06 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: John Andrews, W1TAG, said: > Laurie disappeared over an hour ago, and there was no convincing sign of > Peter by that time, so I'll assume that the ionosphere has moved on to deeds > of more exalted usefulness. We just don't seem to get more than one > spectacular night at a time, which may be valuable information in its own > right. Our knowledge of propagation for 73kHz is not as good as it was for 136kHz. On the tests with John, VE1ZJ, on 136kHz we had the advantage of the CFH transmitter, which was close in frequency and path direction and length. By monitoring CFH, Alan was able to make some good predictions. In addition we were able to monitor this and inform John by HF link and therefore were able obtain instant feedback of when a good propagation peak was approaching. Laurie provides good beacon on 73kHz but only tell us what is going on above a certain level. In addition it requires considerable transmitting effort by Laurie - there might be a better way. When I switched off my transmitter last night at 0115 I received Lauries beacon at S9+5dB on the S meter. I tuned to the Rugby RTTY and it was coming in at S9+45dB. Laurie is about 15 miles to the West of me; Rugby is 100miles to the North - this will give the North American and Canadian guys some idea of the strength of the 73.3kHz transmission from Rugby. Could this transmission be used to monitor 73.3kHz on a regular basis? Perhaps it has and it has somehow passed me by! Regards, Peter, G3LDO e-mail Web