[Propagation] HL to CE

[Carl K9LA <k9la@gte.net>]

 Pete,

With the HL antipode about 1600km east of CE, it is unlikely that the 
antipode had anything to do with your long-ago summer QSOs from HL to CE.

The summer of 1965 was just a half year or so after solar min between 
Cycle 19 and 20. Propagation to NA probably wasn't too good since the 
paths to NA would go to the higher latitudes (a minimum of 50 degrees to 
the West Coast, and even higher to the Midwest and the East Coast), 
where the MUFs would be low.

But your path from HL to CE stayed below roughly 35 degrees latitude on 
both ends, so I suspect the equatorial ionosphere was a big factor. It's 
also possible, depending on the specific time of day and how early in 
the summer it was, that an ionosphere-ionosphere mode in the dark 
ionosphere along the short path (chordal hops or ducting) occurred due 
to the tilts in the ionosphere near your sunset and near CE's sunrise - 
this would help the signal strength significantly.

Carl K9LA

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