Return-Path: Received: (qmail 15740 invoked from network); 7 Jan 2003 21:35:38 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 7 Jan 2003 21:35:38 -0000 Received: (qmail 25927 invoked from network); 7 Jan 2003 21:35:11 -0000 Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 7 Jan 2003 21:35:11 -0000 X-Priority: 3 X-MSMail-Priority: Normal X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.12) id 18W1MK-0006LV-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 07 Jan 2003 21:34:04 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from [166.82.1.68] (helo=host3.ctc.net) by post.thorcom.com with esmtp (Exim 4.12) id 18W1MJ-0006LM-00 for rsgb_lf_group@blacksheep.org; Tue, 07 Jan 2003 21:34:03 +0000 Received: from att.net ([166.82.181.250]) by host3.ctc.net (InterMail vK.4.03.05.03 201-232-132-103 license 2d687b22c655f23831a2faa19b737467) with ESMTP id <20030107213451.RDOI14361.host3@att.net>; Tue, 7 Jan 2003 16:34:51 -0500 Message-ID: <3E1B4811.66E1C9B0@att.net> Date: Tue, 07 Jan 2003 21:35:13 +0000 From: "Dexter McIntyre" X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: "RSGB LF" , "lowfer" Subject: LF: 15db drop in HBG today, 2003-01-07-0600 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=0.5 required=6.0tests=SPAM_PHRASE_00_01,USER_AGENT_MOZILLA_XM,X_ACCEPT_LANGversion=2.43 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false There was a sudden 15 dB drop in the 75 kHz HBG signal received here in NC at just before 0600 UT. Looks like it was down for about half and hour then suddenly came back up to normal. The noise floor, which usually fluctuates with propagation changes, remained constant during this time. Transmitter maintenance maybe? Plot can be seen at: http://www.w4dex.com/75khz/hbg07dec02.jpg Near real time plot can be seen at: http://www.w4dex.com/75khz/hbg.jpg Dex