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[195.171.43.25]) by mx.google.com with ESMTP id e5si2308903wix.40.2013.11.02.06.19.01 for ; Sat, 02 Nov 2013 06:19:02 -0700 (PDT) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org; dkim=pass header.i=@mx.aol.com Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Vcanj-00043i-Nx for rs_out_1@blacksheep.org; Sat, 02 Nov 2013 12:59:39 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Vcanj-00043W-4T for rsgb_lf_group@blacksheep.org; Sat, 02 Nov 2013 12:59:39 +0000 Received: from omr-m06.mx.aol.com ([64.12.143.80]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1Vcang-0005bi-Lc for rsgb_lf_group@blacksheep.org; Sat, 02 Nov 2013 12:59:38 +0000 Received: from mtaout-db04.r1000.mx.aol.com (mtaout-db04.r1000.mx.aol.com [172.29.51.196]) by omr-m06.mx.aol.com (Outbound Mail Relay) with ESMTP id A7B62700000A0 for ; Sat, 2 Nov 2013 08:59:33 -0400 (EDT) Received: from White (95-91-237-85-dynip.superkabel.de [95.91.237.85]) by mtaout-db04.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 7D15FE000081 for ; Sat, 2 Nov 2013 08:59:32 -0400 (EDT) Message-ID: <5632A511F4A1402C951A2CBB74F6E324@White> From: "Markus Vester" To: Date: Sat, 2 Nov 2013 13:59:32 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 x-aol-global-disposition: G X-AOL-VSS-INFO: 5600.1067/94827 X-AOL-VSS-CODE: clean DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1383397173; bh=t1mnRS62q2DNBOjTDhSqWlJYBisrrh91MzeYnEt7Hl4=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=HpLqTj4jV2ZxHSRMNbwCPULWFbMIf1PBge+STy3ZYy0LtzCiAA+8sJuGhW2VSBxUS MmZ22w6emSpDv5Xuquqs/P132D04mpci7ZT62JwAVu+CsAn2Gh0aP9T+wQia2SRfu3 /3qR7EkO2tERQoMY8Xuy7kocOGYaBpPWmkoekRQk= x-aol-sid: 3039ac1d33c45274f7343971 X-AOL-IP: 95.91.237.85 X-Spam-Score: -0.5 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Edgar, yes crosscorrelation would be possible, but I doubt that there will be a large additional benefit. One method would be image-based spectrogram cross correlation. Some time ago I have tried that on earlier DX captures. When the search was fed with a correctly sized template, it automatically produced a correlation peak at the right freqiuency and time offset. However when the peak was strong enough to be statistically significant, at least part of the pattern was also clearly visible in the first place. The naked eye seems to be pretty good at detecting simple patterns in the noise. [...] Content analysis details: (-0.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [64.12.143.80 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.5 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 DC_PNG_UNO_LARGO Message contains a single large inline gif 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: b3b0f15d0cbaee08765b7bacd0352512 Subject: Re: LF: Tasmania? Content-Type: multipart/mixed; boundary="----=_NextPart_000_0030_01CED7D3.C15B23D0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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 Status: O X-Status: X-Keywords: X-UID: 3075 Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0030_01CED7D3.C15B23D0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0031_01CED7D3.C15B23D0" ------=_NextPart_001_0031_01CED7D3.C15B23D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Edgar, yes crosscorrelation would be possible, but I doubt that there will be = a large additional benefit. One method would be image-based spectrogram cross correlation. Some time = ago I have tried that on earlier DX captures. When the search was fed = with a correctly sized template, it automatically produced a correlation = peak at the right freqiuency and time offset. However when the peak was = strong enough to be statistically significant, at least part of the = pattern was also clearly visible in the first place. The naked eye seems = to be pretty good at detecting simple patterns in the noise.=20 Such a correlation process is linear and thus additive, in the sense = that a random very bright voxel might contribute as much energy to the = correlation result as a weaker matching structure. However regarding = extra certainty, you would rather have an "AND" (or multiplicative) = connection of individual parts: If the signature contains three dashes, = and each of them alone has a 20% false positive probability, the total = false rate should be more like 0.2^3 =3D 0.8%. Another option would be going back to the original complex waveform and = using phase-sensitive correlation. This would have a significant = advantage if the message were spread over a large number of symbols, = which can then be added coherently (like in Op deep search). But with = only three or five dashes, there's not really much to gain. Also the = phase-evolution has to be known a priori or modelled, which is a bit = more difficult for a DFCW signal (integer duration * shift, eg 240s * = 0.075Hz =3D 18 ?), and over an unstable path. >From my point of view, the best contribution to a "proof" would now be = verifying the receiver's frequency calibration offset. On yesterday's = screenshots, the HGA22 line seemed to be just half a pixel below the = tick. Simply by zooming in on it you could measure the offset much = better, even though the line is spread by some tens of milliHz due to = the FSK modulation. Last year I took some effort to measure HGA's idle = frequency in detail against a calibrated Rubidium source. The result was = 135430.022 Hz, with only very little variation of a milliHz or so (see = attached). Best 73, Markus (DF6NM)=20 From: edgar=20 Sent: Saturday, November 02, 2013 4:02 AM To: rsgb_lf_group@blacksheep.org ; Markus Vester ; Stefan Sch=E4fer=20 Subject: Re: LF: Tasmania? Hi Markus, Stefan, Is it possible to search for the dashes using cross-correlation? A wave file of the signals received at Orford is available. Format is 16 bit, 22050 Hz. Unfortunately I would have to travel to Orford to retrieve them due to = their size! But that can be done if it is worth it. Regards, Edgar Moonah, Tasmania. ------=_NextPart_001_0031_01CED7D3.C15B23D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Edgar,
 
yes crosscorrelation  would be = possible, but I=20 doubt that there will be a large additional benefit.
 
One method would be image-based = spectrogram cross=20 correlation. Some time ago I have tried that on earlier DX = captures. When=20 the search was fed with a correctly sized template, it automatically = produced a=20 correlation peak at the right freqiuency and time offset. However when = the peak=20 was strong enough to be statistically significant, at least part of the = pattern=20 was also clearly visible in the first place. The naked eye seems to be = pretty=20 good at detecting simple patterns in the noise.
 
Such a correlation process is linear = and thus=20 additive, in the sense that a random very bright voxel might = contribute as=20 much energy to the correlation result as a weaker matching=20 structure. However regarding extra certainty, you would rather have = an=20 "AND" (or multiplicative) connection of individual parts: If the = signature=20 contains three dashes, and each of them alone has a = 20% false positive=20 probability, the total false rate should be more like 0.2^3 =3D=20 0.8%.
 
Another option would be going back to = the original=20 complex waveform and using phase-sensitive correlation. This = would have a=20 significant advantage if the message were spread over a large = number of=20 symbols, which can then be added coherently (like in Op deep search). = But with=20 only three or five dashes, there's not really much to = gain. Also=20 the phase-evolution has to be known a priori or modelled, which is = a bit=20 more difficult for a DFCW signal (integer duration * shift, eg = 240s *=20 0.075Hz =3D 18 ?), and over an unstable path.
 
 
From my point of view, the = best contribution=20 to a "proof" would now be verifying the receiver's frequency = calibration=20 offset. On yesterday's screenshots, the HGA22 line seemed to = be just=20 half a pixel below the tick. Simply by zooming in on it you=20 could measure the offset much better, even though the line = is spread=20 by some tens of milliHz due to the FSK modulation. Last year=20 I took some effort to measure HGA's idle frequency in detail = against a=20 calibrated Rubidium source. The result was 135430.022=20 Hz, with only very little variation of a milliHz or so (see=20 attached).
 
 
Best 73,
Markus (DF6NM) 
 

From: edgar
Sent: Saturday, November 02, 2013 4:02 AM
Subject: Re: LF: Tasmania?

Hi Markus,=20 Stefan,

Is it possible to search for the dashes using=20 cross-correlation?

A wave file of the signals received at Orford = is=20 available.

Format is 16 bit, 22050 Hz.


Unfortunately I = would=20 have to travel to Orford to retrieve them due to their size!

But = that can=20 be done if it is worth it.

Regards, Edgar
Moonah,=20 Tasmania.


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