If I remember correctly, Dean Straw said that the ARRL crunched the
numbers back in the mid-90's using a computer that took a few days, but
I'm not sure it really matters. We're talking optimum takeoff/arrival
angles here, and I'm not sure that angle is a strong function of F-layer
densities. It would be pretty easy to check ... just run a few paths in
VOACAP for the same hour of the day using two different SSNs and compare
the TANGLE results for various frequencies.
73,
Dave AB7E
On 7/31/2013 8:42 PM, Roger wrote:
But is average really average. The sunspot cycles highs and lows we
have recently experienced are quite different than previous cycles and
so far this is reportedly, the lowest in a hundred years.
From what cycle are the averages taken, or is the information updated
to reflect current cycles?
I don't remember 40 ever being consistently as good for DX throughout
the nights as it was for 4 or 5 recent years.
73
Roger (K8RI)
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