Over the years I have seen a few comments with respect to signal peaking around local midnight. If you search on "midnight signal peaking" in the topband archives, you should come up with four results. The one from DJ8WL back in Nov 96 appears to be the only relevant one that I found.
I don't know if this is somewhat consistent or just coincidental with the variability of the ionosphere. Regardless, any physical explanation likely involves D region chemistry. Carl K9LA _________________ Topband Reflector Archives - http://www.contesting.com/_topband
