Return-Path: X-Spam-DCC: paranoid 1481; 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=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, SPF_PASS 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 u9MFjOmA003994 for ; Sat, 22 Oct 2016 17:45:24 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bxyPw-0003oD-ET for rs_out_1@blacksheep.org; Sat, 22 Oct 2016 16:41:04 +0100 Received: from [195.171.43.34] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bxyPv-0003o4-Uc for rsgb_lf_group@blacksheep.org; Sat, 22 Oct 2016 16:41:03 +0100 Received: from smtpout4.wanadoo.co.uk ([80.12.242.68] helo=smtpout.wanadoo.co.uk) by relay2.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1bxyPt-0000Hj-5o for rsgb_lf_group@blacksheep.org; Sat, 22 Oct 2016 16:41:02 +0100 Received: from AGB ([109.180.89.111]) by mwinf5d52 with ME id yfgv1t00H2Q8qX903fgvXh; Sat, 22 Oct 2016 17:40:58 +0200 X-ME-Helo: AGB X-ME-Date: Sat, 22 Oct 2016 17:40:58 +0200 X-ME-IP: 109.180.89.111 Message-ID: <13C0C25482A94912AB3B3AE52A745B86@AGB> From: "Graham" To: References: <580A925A.9000603@lineone.net> <163F863FB932436E8D8DBC12AF91F375@AGB> <580B3D5F.4010501@lineone.net> In-Reply-To: <580B3D5F.4010501@lineone.net> Date: Sat, 22 Oct 2016 16:37:46 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Scan-Signature: fb3e28a759dea7e01d34d3fe7de7ae98 Subject: Re: LF: Simultaneous decoding of WSPR on LF Content-Type: text/plain; format=flowed; charset="utf-8"; reply-type=response 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 10.1.3.11 Content-Length: 3104 Status: O X-Status: X-Keywords: X-UID: 9144 Hugh , By 'time' I was more concerned with the synchronisation , along the time line , ' clock jitter ' in computer speak .. if sections of the time line are displaced due to IRQ action or similar , you could reduce the system's ability to reach maximum - s/n Opera requires ~ min of 40% capture of the Tx signal , along the time line , either randomly , blocks or 40/60 split , using manchester coding , each data 'bit' is self-sync , so it impossible to 'loose' lock.. where as a conventional system would need to establish sync at the start ,...... as long as 40% of the opera recovered [or sent !] plays ball , it will decode , [ or detect for dynamic, has the same 40% requirement] or in wspr case , sync is provided externally If the time line is then jumped , the system will no be able to recover the data , and as in the 2 pass wspr , unless the two signals are exactly the same in time and coherent phase , the expected +3 dB gain cannot be realised . 73-G, -------------------------------------------------- From: "LineOne" Sent: Saturday, October 22, 2016 11:20 AM To: Subject: Re: LF: Simultaneous decoding of WSPR on LF > I checked the PC time and it seems that the Realtek software stops "net > time" from loading on occasions so, for another reason as well, I > eventually found some older Realtek software that doesn't do this. The > software supplied with the motherboard will not share the "line out" with > any software if it's used for, as I do, a small speaker amplifier. It has > to have the Realtek drivers loaded otherwise no audio at all. > > 73, Hugh > > On 21/10/2016 23:27, Graham wrote: >> May be down to time Hugh , >> >> Opera is free running, so absolute time reference has no effect on the >> system performance .. >> >> Stephan should have the solution, his night garden uses similar >> things . >> >> The other is cpu loading ? >> >> 73-G, >> >> -------------------------------------------------- >> From: "LineOne" >> Sent: Friday, October 21, 2016 11:10 PM >> To: >> Subject: LF: Simultaneous decoding of WSPR on LF >> >>> So far I've been decoding Opera32, WSPR2 and WSPR15 simultaneously on an >>> old IBM "Thinkpad" in the shack. This weekend I've managed a wireless >>> connection to a desktop PC in the house so only a receiver is running in >>> the shack leaving nice, clean signals. >>> >>> Decoding Opera 32 is going well (3000km best so far this evening) but >>> the PC, with the same operating system and radio software, will not >>> decode any WSPR at the same time. I haven't yet tried running just >>> WSPR-X (for WSPR2) on it's own but it does show a good signal on the >>> waterfall if I arrange a 1.5kHz heterodyne in the shack. Why would a >>> supposedly superior computer refuse to cooperate, I suspect the Realtek >>> on-board sound card and software is not actually up to the job? >>> >>> 73, Hugh, M0DSZ >>> >>> >>> >> >> > >