Dear LF group,
The graphs in Terman show only a modest 3-4 dB variation in
signal level over the sunspot cycle - but what they don't show is
what the signal-to-noise ratio was. The high noise level on LF is
one of the major factors deciding if communications can take place
or not. If a lot of the background noise on the band is from distant
electrical storms, one would expect the noise level to be subject to
the same propagation effects as the signals are. It could go either
way I suppose, so I await the solar minimum with interest.
Cheers, Jim Moritz
73 de M0BMU
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