What I see is that the changes in isotropic reference definition in the
presence of a ground cause the program to show greater gain numbers that
make the casual user conclude that there is a gain caused by the
presence of the earth that is not there when signal strength in the main
lobe is measured compared to that antenna in free space.
73, Jerry, K0CQ
On 1/8/2011 6:48 AM, Steve Hunt wrote:
> Jerry,
>
> I can understand that the interpretation of dBi which appears in most
> engineering texts (and possibly the IEEE definition?) throws up
> conundrums with which you are uncomfortable. But what I think is unfair
> is to claim that EZNEC is in error, simply because it adopts the
> "industry standard" interpretation rather than an alternative that you
> might prefer.
>
> I make widespread use of EZNEC, and when I saw someone as authoritative
> as yourself state that it is 3dB in error I felt it needed further
> investigation!
>
> 73,
> Steve G3TXQ
>
> On 08/01/2011 00:20, Dr. Gerald N. Johnson wrote:
>> My conundrum is that I expect equal power intensity at the the measuring
>> point from the isotropic source whether a ground plane is involved or
>> not and that I also expect equal intensity from a vertical dipole in
>> free space and a quarter wave vertical on the ground plane (except for
>> the ground absorption at the real ground plane).
>>
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