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From: Paul Nicholson <vlf0403@abelian.org>
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Date: Sun, 29 Jan 2017 17:26:09 +0000
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Subject: Re: ULF: EbNaut over 3 wavelengths on ULF
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Jim wrote:

 > Excellent diagnostic method and implementation.

The method has some weaknesses Jim but in the absence of any
artificial signals it's the best I can do.  I must repeat
the exercise when we next get a thunderstorm nearer to
Heidelberg.  Looking at the spectrum of the sferics will
reveal if we have some ground/sky wave cancellation at
that frequency and range.

Stefan wrote:

 > From the known decoded EbNaut messages, what was the SNR at
 > Renato or on your side?

Nothing detectable here or at Cumiana so I can't answer the
question of how many days need stacking.  Until there is some
glimpse of a signal, it is completely unknown.  I can only
estimate a lower limit.

With your estimated ERP I think something should be detectable
in one day or two.  But stacking two days of your recent
carrier shows nothing.  Even with my more conservative ERP
estimate I would expect to see something of your signal.

Between 2016-06-26 13:00 and 2016-07-31 08:00 you transmitted
carrier with 30mA antenna current.  I received and stacked
over 34 days of carrier (about 15dB stacking gain) with no
sign of signal.  You estimated 100nW ERP.

Now you can do 150mA current - about 14dB gain over July's
signal.  Plus, improvements here to filtering and blanking
may add 2 or 3dB more.

We can in two days exceed the stacked signal for the whole
of July.  Also with your higher ERP I can see the signal each
day at Bielefeld to check the phase.

I think we should try some daytime carrier repeats.  Already we
know there is nothing after 2 days so we will need at least
4 days to get a hint of signal and then at least 10 days to
collect enough signal for some measurements.  It is surely
certain that we will eventually pick up the signal after
enough days.

I'm thinking about shutting down my workstation to install
an extra scratch disk which will speed up the signal search.
It's been busy for 137 days so no chance to close it down.
There are still 154 jobs running though.

--
Paul Nicholson
--