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Re: LF: Re: Re: 8270Hz - on air

To: <[email protected]>
Subject: Re: LF: Re: Re: 8270Hz - on air
From: "Markus Vester" <[email protected]>
Date: Sun, 3 May 2015 12:12:11 +0200
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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,

Sent: Sunday, May 03, 2015 8:16 AM
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.

Paul Nicholson

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