Crawford,
Putting those field strengths into a -2dBi antenna (about the max gain
of a vertical over average ground):
1uv/m at 4500km = -84dBm
-20dB ref 1uv/m at 7000km = -104dBm
-40dB ref 1uv/m at 10,000km = -124dBm.
So it looks like the extrapolation is going to be very close to
Proplab's -135dBm at about 12,000km. I think the extrapolation was
destined to agree with Proplab since a multi-hop path in the dark
ionosphere on 160m is a string of very similar single hops - so if the
first hop is good, extrapolating a bunch more shouldn't be too far off.
Then again . . .
Carl K9LA
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