Indeed! Apollo 11 landed close to 2 km downrange from the center of the
planned landing footprint. This was the result of a lunar gravitational
potential model that didn't exactly match the real world. No one
screwed up, the computer worked correctly, the potential model was fine
except that it possibly applied to some other moon in the solar system,
of which there are many, just not to ours.
NEC-2 [e.g. EZNEC] is a good model but one has to be knowledgeable of
its limitations. It can, for example, return wildly wrong source
impedance values if the source is connected to the end of a wire.
73,
Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn
On 5/20/2017 10:18 PM, Jim Brown wrote:
Brown's first law -- "if you think there's a difference between theory
and practice, you don't know enough about one or the other."
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