Return-Path: Received: (qmail 10122 invoked from network); 14 May 2001 22:32:54 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 14 May 2001 22:32:54 -0000 Received: (qmail 1949 invoked from network); 14 May 2001 22:32:23 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 14 May 2001 22:32:23 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14zQoy-0008BQ-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 14 May 2001 23:28:08 +0100 Received: from chalfont.mail.uk.easynet.net ([195.40.1.44]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14zQox-0008BL-00 for rsgb_lf_group@blacksheep.org; Mon, 14 May 2001 23:28:07 +0100 Received: from ericadodd (tnt-3-238.easynet.co.uk [195.40.202.238]) by chalfont.mail.uk.easynet.net (Postfix) with SMTP id 6E755F81E5 for ; Mon, 14 May 2001 23:27:33 +0100 (BST) Message-ID: <001101c0dcc5$8c1aab80$eeca28c3@ericadodd> From: "g3ldo" To: rsgb_lf_group@blacksheep.org References: <003001c0dc93$732ff580$265997d4@W98.swipnet.se> Subject: LF: Re: T/A tests. Date: Mon, 14 May 2001 23:30:00 +0100 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: sm6pxj said "Radio Engineer's Handbook" by Terman (1943): http://home5.swipnet.se/~w-54761/terman1.jpg http://home5.swipnet.se/~w-54761/terman2.jpg There seems to be a close correlation between sunspot numbers and yearly average of signal strength for T/A LF signals. Maybe we better catch the train. This should not surprise us. We know that the best DX condx on the 1.8MHz band occur during periods of low sunspot activity. My 1.8MHz CW QSO with Stew Perry, W1BB, (from 9L1, using less than 1w erp) occurred in July 1964, which coincided with the sunspot minimum. The illustrations from Terman are exactly the same as in my 1937 (2nd) Edition. I had considered including this material in the LF Handbook but there were copyright issues of which I was unsure. It is interesting that a statistical analysis of the reception of Laurie's transmissions by John are in line with the graphs in the Terman book. It would seem that our LF experiments have been carried out in less than optimum conditions and that there is a lot better to come. Regards, Peter, G3LDO e-mail Web