AI4QJ wrote:
"Richard Clark" wrote in message
...
On Fri, 15 Feb 2008 12:37:55 -0800 (PST), wrote:
AI4QJwrote:
I suspect that the EZNEC program is not designed for taking into
account
such "rare" phenomena as "ground wave propagation". So much for EZNEC
analysis at 75m.
...
EZNEC information tells you nothing about ground wave
propagation.
Two things wrong with this:
1. EZNEC does provide information about the radiation characteristics
along ground at any distance on an infinite, flat plane and at any
elevation above it;
Really? Can it follow the curvature of the earth from say, Illinois to
Germany?
Is there some part of "infinite, flat plane" that you fail to understand?
2. EZNEC is not a propagation modeler as its users are well aware;
If it cannot predict take-off angle then what good is it? It doesn't matter
if we warm the clouds directly above?
EZNEC provides horizontal, vertical and 3D radiation patterns. Is there
some other dimension you are interested in?
3. EZNEC models the 100M work of Brown, Lewis, & Epstein quite
closely. There is nothing in the body of RF literature to suggest
that the nature of radiation shifts suddenly in 7/8ths of a megahertz.
Yes, there is no abrupt shift at 75m (most obviously). Quite simply, as you
approach larger wavelengths, skywave characterstics lessen and groundwave
characteristics increase.
Which are functions of propagation, not antenna modeling.
But I am a heretic for not having mindlessly bowed in adoration at the altar
of the EZNEC god in blind faith as you and others have done. However, those
fanatic evangelists who live by blind faith alone have wisely plonked me so
as not to let their blood pressures rise at the spectre of the EZNEC god
being angered.
No, you sound more like someone with a grudge mixing apples and oranges.
--
Jim Pennino
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