Return-Path: Received: from rly-df01.mx.aol.com (rly-df01.mail.aol.com [172.19.156.14]) by air-df01.mail.aol.com (v125.7) with ESMTP id MAILINDF012-5264ae9bed626a; Thu, 29 Oct 2009 12:12:36 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-df01.mx.aol.com (v125.7) with ESMTP id MAILRELAYINDF013-5264ae9bed626a; Thu, 29 Oct 2009 12:12:07 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1N3Xaq-0004L3-Qs for rs_out_1@blacksheep.org; Thu, 29 Oct 2009 16:11:20 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1N3Xaq-0004Ku-Ba for rsgb_lf_group@blacksheep.org; Thu, 29 Oct 2009 16:11:20 +0000 Received: from moutng.kundenserver.de ([212.227.126.186]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1N3Xac-0007wF-4S for rsgb_lf_group@blacksheep.org; Thu, 29 Oct 2009 16:11:08 +0000 Received: from [192.168.1.64] (188-221-89-85.zone12.bethere.co.uk [188.221.89.85]) by mrelayeu.kundenserver.de (node=mreu1) with ESMTP (Nemesis) id 0LoMIP-1MW6Zx1cKn-00fq4G; Thu, 29 Oct 2009 17:11:00 +0100 From: "Dave Sergeant" To: rsgb_lf_group@blacksheep.org Date: Thu, 29 Oct 2009 16:11:00 -0000 MIME-Version: 1.0 Message-ID: <4AE9BE94.13075.213B242@dave.davesergeant.com> In-reply-to: <20091029094436.8EFF831E702@smtps01.kuleuven.be> References: , <20091029094436.8EFF831E702@smtps01.kuleuven.be> X-mailer: Pegasus Mail for Windows (4.51) Content-description: Mail message body X-Provags-ID: V01U2FsdGVkX1+cF2+jS4N+SuDwWC6tSy69kix4jwHnTL8Nued H3x05OuOGRPdDKZaHB4FYC5TiY3TQIeT5bj/5s8juEdJepJp8b sRUjETJHlCnNRYSKAFxj3aeE4Z/1+JN X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: 500kHz propagation Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 On 29 Oct 2009 at 10:44, Rik Strobbe wrote: > Over the past days I monitored the G4JNT WSPR beacon 24/24. > During daytime I have a weak but consistent copy of Andy's signal, > average -24dB with ups and down of some dB. During nighttime the signal > is -10dB on average, with the usual deep QSB (peaking -1dB, dips down to > -20dB). But the most interesting observation is that in the afternoon > the first peaks (from -24dB up to -8dB) occur as early as 15:45 UTC. > This is almost 1 hour before sunset (16:37 UTC) and almost 1.5 hours > before the D-layer (at mid point) goes into darkness. > > 73, Rik ON7YD - OR7T > > This behaviour on 500kHz mirrors closely that which we get on 160m. Certainly in the winter months and to some extent in the autumn the nearer continentals are audible on top band throughout the day and from 1-2 hours before sunset more distant stations such as OK and OH start coming through. As always the problem is lack of activity, and events such as CQ160 and the Stew Perry contest show how much before sunset and after sunrise there is propagation. ON and PA0 are not really that far from G4JNT in Portsmouth so I am not really surprised you are copying them in the daytime. Here in Bracknell, IO91PJ, G4JNT is s9+ on the meter at all times, both as the normal beacon and WSPR. I think the only thing different on 500kHz is the very slow QSB, which does seem unique to that band. 73 Dave G3YMC http://www.davesergeant.com