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RE: ULF: EbNaut over 3 wavelengths on ULF

To: <[email protected]>
Subject: RE: ULF: EbNaut over 3 wavelengths on ULF
From: <[email protected]>
Date: Thu, 2 Feb 2017 15:45:01 -0500
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Stefan and Paul,

The attached shows B-field FDTD results.   Comparing with the E-field plot 
(previous message): the decorrelation of E and B in the region of interest 
(2kHz - 4kHz) is interesting.


Jim AA5BW  

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Paul Nicholson
Sent: Sunday, January 29, 2017 12:26 PM
To: [email protected]
Subject: Re: ULF: EbNaut over 3 wavelengths on ULF

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

Attachment: FDTD Plot 2 of 2 (B field).jpg
Description: JPEG image

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