On Wed, 18 Mar 98 16:07:29 -0500 John Kaufmann <kaufmann@ll.mit.edu>
writes:
>At 03:38 PM 3/18/98 EST, you wrote:
>>C'mon John....you said nor explained nothing.
>>Does NEC-4xx accurately model on or near ground radials or not??
>With
>>your MIT - MITRE involvement I think that you can answer this.
>>The bottom line for me is...do I want to spend hours dragging out
>wires
>>for under 1dB improvement...OR can I expect up to 5-6dB for my sweat?
>>
>>
>
>I have no inside information on NEC-4 nor have I used it, so I cannot
>pretend
>to answer the question of whether NEC-4 does what you want. All I am
>saying is
>that the author of the widely used EZNEC software (which is
>essentially NEC-2
>with a user-friendly interface) has his doubts about whether the
>software can
>correctly model elevated radials, despite what is said in the
>literature.
>If he
>doesn't trust it, would you?
I have not heard him say that....others I will have to discount as
heresay. After all he is fully aware of this reflector and the
discussion. That also does not answer the NEC-4xx questions.
73 Carl KM1H
>
>As much as we engineers like to rely on computers (and I'm as "guilty"
>of
>this as
>anyone), they are good only if they accurately model what happens it
>the real
>world. In my work, we ultimately verify everything by building or
>testing
>in the
>lab or in the field. When the field data says something different
>than the
>computer
>does, then it's time to re-examine the models. My opinion is that we
>are
>in that
>situation now and until it is sorted out, I'm going to stick with lots
>of
>radials on
>the ground.
>
>73, John W1FV
>
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