Return-Path: X-Spam-DCC: paranoid 1102; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tAQKMcwG025775 for ; Thu, 26 Nov 2015 21:22:38 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a230f-0006Zh-Qy for rs_out_1@blacksheep.org; Thu, 26 Nov 2015 20:19:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a230f-0006ZX-IS for rsgb_lf_group@blacksheep.org; Thu, 26 Nov 2015 20:19:17 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a22zU-0000xE-7G for rsgb_lf_group@blacksheep.org; Thu, 26 Nov 2015 20:19:16 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 0213A3273EB for ; Thu, 26 Nov 2015 20:08:58 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id D8A7828A0120 for ; Thu, 26 Nov 2015 20:17:47 +0000 (UTC) Message-ID: <565768EB.8020005@abelian.org> Date: Thu, 26 Nov 2015 20:17:47 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <8D2F65B1A10F9AD-BB0-17B085@webmail-vm018.sysops.aol.com> In-Reply-To: X-Scan-Signature: 66d07794ca19cd68f7d6cc289cd4ac18 Subject: Re: LF: More EbNaut 137.777 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 5341 Final result time Eb/N0 T-Offset Phase 00:00 no decode, tried very hard 00:30 -0.8 dB +1.8 -30 -60 -60 -90 (rank 35975 BER 36.8%) 01:00 10.8 dB +2.9 0 0 30 30 01:30 8.4 dB +4.2 -90 -90 -60 -60 02:00 9.7 dB +5.7 -30 -30 0 0 02:30 8.0 dB +6.7 180 180 -150 -150 03:00 11.6 dB +7.9 180 180 -150 -150 03:30 12.4 dB +9.1 0 0 30 30 04:00 no decode Most phase patterns show a slight increase in phase lead, so the frequency is a bit higher than 137.777000 this time. Wonder what happened to the signal before 01:00, it was very weak, 00:30 was right on the limit. Joe I hope you can fix the Arduino clock. Is it losing RTC interrupts or something? Or just a slow xtal? Do you have a Raspberry Pi? I can quickly put together a keyer program. It would be fun to do a really weak signal test with longer symbols but the clock will drift too much by the end of the message. Markus wrote: > Actually, each station operator is using his own > unique home-grown setup: That's a wonderful summary, thanks. W4DEX and other VLF stations could also go on the list too. Various mentions of previous experiments with coherent signals. I've been following those up and found some interesting reading and good results. But coherent operation never caught on for some reason. Maybe too fiddly and expensive? We're lucky today because PCs are better and GPSDOs only cost a day's wages not a month's. I'm enjoying dabbling with this and it revives my interest in amateur radio. Hopefully we see a few more stations adding themselves to Markus' list. -- Paul Nicholson --