Popularity WSPR bands

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Popularity of 4 bands

Popularity of four bands over the years, I compiled it from the spots counts I found on the website. When 20m gets a lot of spots, then 40m is less popular and the other way around. Percentages are on the y-axis.

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Solar flux F10.7

This is the slightly smoothed solar flux (F10.7) over the same period. I would expect the HF propagation to behave like F10.7, but it should also be noticed that WSPR became more popular over the years.

Last update: 14-Feb-2017

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