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@freepeoplesfreepress dusk and dawn are the ideal times because .. you want the sun to have just start to split the F-layer but before the d-layer forms...
That said 10m performs very well mid day where the d-layer has formed (so absorbs a bit but 10m gets through it best), and the f-layer is fully formed.
Usually when its completely night time you wont get much of any activity on 10m because the F layer is not charged properly to reflect it.
@freepeoplesfreepress Oh and sunspots have a HUGE effect on this and ultimately depending on the activity ont he sun determines what your MUF is (maximum usable frequency)... right nwo the sun is ideal for what we want.