Hi Roger,
You wrote:
...
By the way, do we know exactly WHAT Paul Nicolson does to detect such weak
signals so well? Has anyone heard/read technical details of his
super-sensitive and well engineered receiving systems?
...
AFAIK:
Antennas: crossed loops at ground level, 20m^2 each,
balanced by high quality transformers
~300m apart from any buildings etc. amongst sheep and moles.
(Cannot find the photo from Todmorden...)
RX: 2x LT1028 to some hundred metres of CAT? feeding 2x M-Audio Audiophile
192 running on a Linux box. Both soundcards are synchronized by GPS 1pps
via the 2nd audio channel. Software is homebrewed and consists of a complex
and sophisticated network of building blocks written in C running on Linux
connected via UNIX-streams.
See: http://abelian.org/vlf/spectrum.shtml
A third channel includes the signal from an E-field probe also synchronized
by GPS. So all samples are time stamped (!).
Listen: http://abelian.org/vlf/
(May be you can feed his signal stream to your software?)
The intentions are mainly to detect ionospheric effects.
See his very early attempts: http://abelian.org/sid/
Peter, df3lp
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