Return-Path: X-Spam-DCC: paranoid 1290; 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 t1BKwacg007658 for ; Wed, 11 Feb 2015 21:58:36 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1YLeFi-0004go-BD for rs_out_1@blacksheep.org; Wed, 11 Feb 2015 20:51:18 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1YLeFh-0004gf-MS for rsgb_lf_group@blacksheep.org; Wed, 11 Feb 2015 20:51:17 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.85) (envelope-from ) id 1YLeFg-0007hL-4Q for rsgb_lf_group@blacksheep.org; Wed, 11 Feb 2015 20:51:16 +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 5535C3273D6 for ; Wed, 11 Feb 2015 20:48:58 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 013DD28A039C for ; Wed, 11 Feb 2015 20:51:14 +0000 (UTC) Message-ID: <54DBC0C2.4010806@abelian.org> Date: Wed, 11 Feb 2015 20:51:14 +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: In-Reply-To: X-Scan-Signature: f62c7cf8eeb8e5a327b71719e9bffff1 Subject: Re: VLF: 8270 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: 2305 I'm pleased to report that we got Uwe's BPSK transmission working, after some advice from Markus. The problem was that a phase correcting feedback loop was sampling the signal after the modulator, not before. It was therefore doing quite a good job of undoing the phase shift keying. Uwe made another transmission on Sunday of 12 characters with 10 second symbols and this decoded very easily here in Todmorden, range 762 km. I didn't know that Uwe was going to transmit so was doing some maintenance at the time. The receiver was switched off for nearly 30 minutes of the 150 minute transmission, and the GPS timing system wasn't restored to correct operation until after the transmission ended. Over 60 minutes of the reception did not have reliable timing. Despite all the missing symbols, Uwe delivers such a strong signal that the Eb/N0 averaged +2dB which made it a very easy decode. Expectation based on carrier measurements was at least +2.0 dB. The S/N at the rx output was -74 dB in 2500 Hz. -- Paul Nicholson --