Thanks again Paul. The TX power had been raised by only 1 dB, and the antenna is the same. So the increased signal strength seems to be mostly caused by different propagation during that time of the day.
Best 73,
Markus
Markus wrote:
> ...more carrier on 8270.0025 Hz from 15:25 until QRT at 17:00.
Measures 0.075 fT here which is distinctly stronger than your
usual signal, which recently has been around 0.05fT.
http://abelian.org/vlf/tmp/160226b.gif
Shows up well on the spectrogram
http://abelian.org/vlf/fbins.shtml#p=1456516800&b=120&s=sp
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Paul Nicholson
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