Re: LF: Re: DK7FC's 3rd VLF transmission

[Paul Nicholson <vlf0308@abelian.org>]

My best effort at a spectrogram, added to end of

 http://abelian.org/vlf/ss100321/

Produced after re-running the signal processing without
clock correction.  The spectrogram is normalised for
uniform background.

Unfortunately the message was not copied - the initial
tune-up and first dash of the first K is lost because
the background noise bearing is very close to the signal
bearing.  Here is the noise plot for the day,

 http://abelian.org/vlf/live/100321.9kHz.png

Note the bearing of the noise between 12:00 and 13:00,
and Frankfurt is on 116 deg!  By 13:30 the noise had
shifted far enough to copy the signal.

Too bad the test was not the previous day, when noise
was very low and North/South!

Congratulations to Renato Romero IK1QFK for the longest
distance clearly copied so far - 544km!

Stefan - what was the kite height and current?
--
Paul Nicholson
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