Message-ID: <7907776209724E8AABCD076A6CE1B72D@White>
From: "Markus Vester" <markusvester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
References: <39057AB697834433BAF97C1532272E0E@White> <5545BD3F.7050007@abelian.org>
Date: Sun, 3 May 2015 12:12:11 +0200
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Subject: Re: LF: Re: Re: 8270Hz - on air
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Hi Paul,

thanks for the explanation, perfectly understood. I was actually a bit =
worried as I tend to regard the Todmorden spectrogram as a kind of gold =
standard for sensitivity and accuracy. Well, thanks once again for your =
outstanding and continuous work!

All the best,
Markus


From: Paul Nicholson=20
Sent: Sunday, May 03, 2015 8:16 AM
To: rsgb_lf_group@blacksheep.org=20
Subject: Re: LF: Re: Re: 8270Hz - on air


Markus wrote:

 > somewhat patchy on Paul's steerable VLF-spectrogram.

Yes, there is something wrong with the phase.  The problem
is at my end - looks like a software change to the receive
timing about a week ago has produced a problem.

There is, intermittently, a lot of spiky phase noise.  It is a
delicate compromise between responding quickly to A/D clock drift
and maintaining a low phase noise.

Today I will fix it, if necessary I'll revert to an earlier version.

Your signal is somewhere between 0.05 and 0.10 fT and that should
have produced a quite solid trace on the spectrogram.

--=20
Paul Nicholson
--


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<BODY style=3D"PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: =
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CanvasTabStop=3D"true" name=3D"Compose message area">
<DIV><FONT size=3D2 face=3DArial>Hi Paul,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>thanks for the explanation, perfectly =
understood. I=20
was actually a bit worried as I tend to regard the Todmorden spectrogram =
as a=20
kind of gold standard for sensitivity and accuracy.&nbsp;Well, =
th</FONT><FONT=20
size=3D2 face=3DArial>anks once again for your outstanding and =
continuous=20
work!</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>All the best,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Markus</FONT></DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT=20
face=3DArial></FONT><FONT face=3DArial></FONT><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dvlf0403@abelian.org=20
href=3D"mailto:vlf0403@abelian.org">Paul Nicholson</A> </DIV>
<DIV><B>Sent:</B> Sunday, May 03, 2015 8:16 AM</DIV>
<DIV><B>To:</B> <A title=3Drsgb_lf_group@blacksheep.org=20
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A>=20
</DIV>
<DIV><B>Subject:</B> Re: LF: Re: Re: 8270Hz - on air</DIV></DIV></DIV>
<DIV><BR></DIV>Markus wrote:<BR><BR>&nbsp;&gt; somewhat patchy on Paul's =

steerable VLF-spectrogram.<BR><BR>Yes, there is something wrong with the =

phase.&nbsp; The problem<BR>is at my end - looks like a software change =
to the=20
receive<BR>timing about a week ago has produced a problem.<BR><BR>There =
is,=20
intermittently, a lot of spiky phase noise.&nbsp; It is a<BR>delicate =
compromise=20
between responding quickly to A/D clock drift<BR>and maintaining a low =
phase=20
noise.<BR><BR>Today I will fix it, if necessary I'll revert to an =
earlier=20
version.<BR><BR>Your signal is somewhere between 0.05 and 0.10 fT and =
that=20
should<BR>have produced a quite solid trace on the =
spectrogram.<BR><BR>--=20
<BR>Paul Nicholson<BR>--<BR><BR></BODY></HTML>

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