Return-Path: X-Spam-DCC: paranoid 1170; 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=-2.0 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_30_40,HTML_MESSAGE 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 tAB0Tgfc016616 for ; Wed, 11 Nov 2015 01:29:42 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZwJBN-0004ff-Sq for rs_out_1@blacksheep.org; Wed, 11 Nov 2015 00:22:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZwJBN-0004fW-3M for rsgb_lf_group@blacksheep.org; Wed, 11 Nov 2015 00:22:37 +0000 Received: from omr-a015e.mx.aol.com ([204.29.186.63]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.86) (envelope-from ) id 1ZwJAM-0006zZ-Ep for rsgb_lf_group@blacksheep.org; Wed, 11 Nov 2015 00:22:35 +0000 Received: from mtaout-mcb02.mx.aol.com (mtaout-mcb02.mx.aol.com [172.26.50.174]) by omr-a015e.mx.aol.com (Outbound Mail Relay) with ESMTP id DE7BA38002F9 for ; Tue, 10 Nov 2015 19:21:16 -0500 (EST) Received: from White (ipbcc05f3c.dynamic.kabel-deutschland.de [188.192.95.60]) by mtaout-mcb02.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 216203800008D for ; Tue, 10 Nov 2015 19:21:16 -0500 (EST) Message-ID: From: "Markus Vester" To: References: <66B3F0D918D0471AA6E64E8D19BABAA2@White> Date: Wed, 11 Nov 2015 01:21:14 +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: 5700.7163/106863 X-AOL-VSS-CODE: clean DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1447201276; bh=9oSUIn8b1Xm2Xz16Lm0W8qsB/5DzDAOnVvyrReWGTNM=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=0o5HRbxfZIS3hgO8uJbZY7YgnkPaDMSF5EFMupUciaW2OoidM76rYm8wPPCuVtps4 gZgwGlgbPrP6Z+maBkmQacVYgNQ3O5W9y6Yw/oOw5WtHC45wEm7O+LBGWwIQe4Lgkh L/lzxr2lfssn2KyIiw7ud/T+tihXsKplRh3QNfVU= x-aol-sid: 3039ac1a32ae564289fc14f3 X-AOL-IP: 188.192.95.60 X-Scan-Signature: b6696563999afa34e36d15007cae73e3 Subject: LF: VO1NA frequency Content-Type: multipart/mixed; boundary="----=_NextPart_000_001C_01D11C1F.42012430" 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: 4958 Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_001C_01D11C1F.42012430 Content-Type: multipart/alternative; boundary="----=_NextPart_001_001D_01D11C1F.42012430" ------=_NextPart_001_001D_01D11C1F.42012430 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Joe, the attached plot shows the frequency stability of your opds trace = received last night http://df6nm.bplaced.net/LF/opds32_151110_0736.png . = Each data point is the interpolated peak of a single 438 uHz FFT (i.e. = 38 minute window). The average frequency seems to be 0.7 mHz below = nominal, and there are small temporal variations up to 0.5 mHz in either = direction. Though some of that is probably attributable to noise and = propagation, I believe that there is also a bit of inherent instability = in the frequency source. Actually a few parts per billion is quite good = for a free running OCXO (assuming the "D" stands for "double oven" and = not "discipled"), and that the calibration was done over a 10 MHz HF = link. Is this good enough for EbNaut? During the experiments with IZ7SLZ we = found that for full sensitivity the phase variation over the EbNaut = sequence duration should not be much more than 90=B0. Thus for a = half-hour message the frequency should be ideally constant and known to = about 0.14 mHz. If there is more variation we often can still get = decodes, but we will have to find the best frequency offset by trial and = error, which can be cumbersome if the signal is weak. I also fed opds data files from your Sat/Sun transmissions to the EbNaut = decoder. The idea was to see if your Opera transmissions would actually = produce the all-asterisk decode which is expected for a non-PSK-keyed = straight carrier, and to observe the symbol phase evolution over the 38 = minute duration. Starting midnight UT, one decode was attempted every 30 = minutes, using a setting for 464 raw symbols (4 characters) and 5 = seconds per symbol. A frequency offset of -0.6 mHz was selected to = obtain flat phase during the first decodes, and that offset was kept for = all later attempts. Despite the Opera gaps which degrade or drop half of = the available symbols, 12 out of 13 decode attempts produced the correct = "****" message, e.g. http://df6nm.bplaced.net/LF/r0317.png . However at = times the frequency drift was quite visible on the phase plot, e.g. in = http://df6nm.bplaced.net/LF/s0317.png (flat phase around 3:17) versus = http://df6nm.bplaced.net/LF/s0347.png (upward phase slope around 3:47).=20 Scaling down to VLF, deviations from the same oscillator will be 16x = smaller (~30 uHz at 8.3 kHz). This will be probably good enough even for = narrow FFT bins, corresponding to several hours coherent carrier = integration or slow EbNaut decodes. All the best, Markus (DF6NM) From: jcraig@mun.ca=20 Sent: Saturday, November 07, 2015 3:45 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: VO1NA opds-32 LF Group, Again, thanks to SV8RV DF2JP PA7EY and DF6NM for the reports. In my last post I reported the drift was constrained to within 1 Hz. This should be 1 mHz. Thanks Markus for your assurances that this should be adequate for EbNaut which I hope to use to send send our=20 cat's name on LF. The little curls appear often on the QRSS traces on your high res spectra. Doppler variations were removed from the 10 MHz WWV signals with harmonic regression when the DOCXO was calibrated so this effect is seen on LF but not as strongly. After reading about EbNaut on Paul Nicholson's pages it seems I have=20 much catching up ahead. Fasinating stuff! Can the EbNaut phase inversions be done without an absolute time=20 reference? I'm cheap and lazy so hoping GPS will not be needed. The Opera will be doing an encore tonight and if the wind stays low a tower climbing expedition is planned for the afternoon. 73 Joe VO1NA On Sat, 7 Nov 2015, Markus Vester wrote: > Hi Joe, LF, > > during the last couple of nights, opds detected all of your = transmissions between about 22 and 7:30 UT. > > Attached is a zoomed 40 mHz section from my opds-32 spectrogram, = showing your central coherent carrier which contains half of the = transmitted average power. It seems to be about 0.5 mHz below 137477 Hz = (possibly due to a calibration error in my receiver). The 2.7 mHz spaced = sidelines during the early part (bottom) were caused by = 6-minute-periodic interruptions from my own MF WSPR transmissions. = However the little curls near the carrier can presumably be attributed = to Doppler-shifted multipath components. The carrier was still weakly = visible for another hour after the last detection. > > Comparing the looks of the carrier to earlier IZ7SLZ transmissions, = the stability of the signal and the path seems quite sufficient for = half-hour EbNaut PSK transmissions. Unfortunately I missed the = opportunity to save the raw data and analyze phase evolution using the = EbNaut decoder itself - will try that next time. > > All the best, > Markus (DF6NM) > > > > > From: jcraig@mun.ca > Sent: Saturday, November 07, 2015 12:03 AM > To: rsgb_lf_group@blacksheep.org > Subject: Re: LF: last night opera opds detection in km07ks > > > LF Group, > > > I am grateful to Joe DF2JP for his captures QRSS and Opera > Dionysious SV8RV for his OP decodes to Domenico IZ7SLZ > for his OPDS decodes, and thanks to DF6NM for opds! > > I do not know if my DOCXO is stable enough for EbNaut. > It was set a couple of years ago and has not drifted more than > 1 Hz since then. It seems the phase decoherence has stopped > haunting me. > > I am hoping to replace the halyard for the other 100m wire soon. > > OP32 again tonight as send this email. > > 73 > Joe > > ------=_NextPart_001_001D_01D11C1F.42012430 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Joe,
 
the attached plot shows the=20 frequency stability of your opds trace received last=20 night http://df6nm.= bplaced.net/LF/opds32_151110_0736.png .=20 Each data point is the interpolated = peak of a=20 single 438 uHz FFT (i.e. 38 minute window). The average frequency seems = to be=20 0.7 mHz below nominal, and there are small temporal = variations up=20 to 0.5 mHz in either direction. Though some of that is=20 probably attributable to noise and propagation, I believe that = there=20 is also a bit of inherent instability in the frequency=20 source. Actually a few parts per billion is quite good for a = free=20 running OCXO (assuming the "D" = stands for=20 "double oven" and not "discipled"), and that the calibration was done = over a 10=20 MHz HF link.
 
Is this good enough for EbNaut? During = the=20 experiments with IZ7SLZ we found that for full sensitivity the phase = variation=20 over the EbNaut sequence duration should not be much more than = 90=B0. Thus=20 for a half-hour message the frequency should be ideally constant and = known to=20 about 0.14 mHz. If there is more variation we often can = still=20 get decodes, but we will have to find the best frequency offset by = trial=20 and error, which can be cumbersome if the signal is weak.
 
I also fed opds data files from your = Sat/Sun=20 transmissions to the EbNaut decoder. The idea was to see = if your Opera=20 transmissions would actually produce the all-asterisk decode = which is=20 expected for a non-PSK-keyed straight carrier, and to observe the symbol = phase=20 evolution over the 38 minute duration. Starting midnight UT, one decode was attempted every 30 = minutes,=20 using a setting for 464 raw symbols (4 characters) and 5 seconds = per=20 symbol. A frequency offset of -0.6 mHz was selected to = obtain=20 flat phase during the first decodes, and that = offset was kept for=20 all later attempts. Despite the Opera = gaps=20 which degrade or drop half of the available symbols, 12 out of = 13=20 decode attempts produced the=20 correct "****" message, e.g. http://df6nm.bplaced.net/L= F/r0317.png=20 . However at times the frequency drift was quite visible on = the phase=20 plot, e.g. in http://df6nm.bplaced.net/L= F/s0317.png (flat=20 phase around 3:17) versus http://df6nm.bplaced.net/L= F/s0347.png (upward=20 phase slope around 3:47). 
 
Scaling down to VLF, deviations from = the same=20 oscillator will be 16x smaller (~30 uHz at 8.3 kHz). This will be = probably good=20 enough even for narrow FFT bins, corresponding to several hours = coherent=20 carrier integration or slow EbNaut decodes.
 
All the best,
Markus (DF6NM)

Sent: Saturday, November 07, 2015 3:45 PM
Subject: Re: LF: VO1NA opds-32

LF Group,

Again, thanks to SV8RV DF2JP PA7EY and = DF6NM for=20 the reports.

In my last post I reported the drift was constrained = to=20 within 1 Hz.
This should be 1 mHz.  Thanks Markus for your = assurances=20 that this
should be adequate for EbNaut which I hope to use to send = send our=20
cat's name on LF.  The little curls appear often on the QRSS = traces=20 on
your high res spectra.  Doppler variations were removed from = the 10=20 MHz
WWV signals with harmonic regression when the DOCXO was = calibrated
so=20 this effect is seen on LF but not as strongly.

After  = reading about=20 EbNaut on Paul Nicholson's pages it seems I have
much catching up=20 ahead.  Fasinating stuff!

Can the EbNaut phase inversions be = done=20 without an absolute time
reference?  I'm cheap and lazy so = hoping GPS=20 will not be needed.

The Opera will be doing an encore tonight and = if the=20 wind stays low
a tower climbing expedition is planned for the=20 afternoon.

73
Joe VO1NA


On Sat, 7 Nov 2015, Markus = Vester=20 wrote:

> Hi Joe, LF,
>
> during the last couple of = nights,=20 opds detected all of your transmissions between about 22  and 7:30=20 UT.
>
> Attached is a zoomed 40 mHz section from my opds-32=20 spectrogram, showing your central coherent carrier which contains half = of the=20 transmitted average power. It seems to be about 0.5 mHz below 137477 Hz=20 (possibly due to a calibration error in my receiver). The 2.7 mHz spaced = sidelines during the early part (bottom) were caused by = 6-minute-periodic=20 interruptions from my own MF WSPR transmissions. However the little = curls near=20 the carrier can presumably be attributed to Doppler-shifted multipath=20 components. The carrier was still weakly visible for another hour after = the last=20 detection.
>
> Comparing the looks of the carrier to earlier = IZ7SLZ=20 transmissions, the stability of the signal and the path seems quite = sufficient=20 for half-hour EbNaut PSK transmissions. Unfortunately I missed the = opportunity=20 to save the raw data and analyze phase evolution using the EbNaut = decoder itself=20 - will try that next time.
>
> All the best,
> Markus=20 (DF6NM)
>
>
>
>
> From: jcraig@mun.ca
> Sent: Saturday, = November=20 07, 2015 12:03 AM
> To: rsgb_lf_group@blacksheep.org=
>=20 Subject: Re: LF: last night opera opds detection in=20 km07ks
>
>
> LF Group,
>
>
> I am = grateful=20 to Joe DF2JP for his captures QRSS and Opera
> Dionysious SV8RV = for his OP=20 decodes to Domenico IZ7SLZ
> for his OPDS decodes, and thanks to = DF6NM for=20 opds!
>
> I do not know if my DOCXO is stable enough for=20 EbNaut.
> It was set a couple of years ago and has not drifted = more=20 than
> 1 Hz since then.  It seems the phase decoherence has=20 stopped
> haunting me.
>
> I am hoping to replace the = halyard=20 for the other 100m wire soon.
>
> OP32 again tonight as send = this=20 email.
>
> 73
> = Joe
>
>

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