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Old May 28th 06, 05:15 PM posted to rec.radio.amateur.antenna
Roy Lewallen
 
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Default Grounding a metal roof

Bart Bailey wrote:
In Message-ID:F5aeg.27941$QP4.12044@fed1read12 posted on Sat, 27 May
2006 21:58:13 -0700, Sal M. Onella wrote:

You're probably
referring to the model range(s) at Naval Ocean Systems Center (NOSC) on
Point Loma. NOSC was consolidated, I think, into Space and Naval Warfare
Systems Center, San Diego.


I don't know what it's called now, was NOSC, then NRAD, and could be
consolidated with SPAWAR/Lockheed these days.
...and yes it was for doing analyses of maritime antennas and their
mutual effects with the ship's superstructure.


I visited and was given a tour of that site some years ago, when it was
NRaD. They were also doing computer modeling with NEC-4 of the same
ships and structures they were measuring. One of the engineers told me
that when the results from the computer model disagreed with
measurements from the physical model, they'd learned to believe the
computer model.

This was a statement of just how difficult it is to make really good
measurements, even when you have the best equipment. Accurate computer
modeling of complex structures is no trivial task, either, but it was
something they were very good at.

Roy Lewallen, W7EL
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