On Nov 28, 3:24*pm, Richard Clark posted:

Can you not view the screen clip at the link I posted showing this?
Why do you keep asking?

Because in a commercial release, suitable to professional and
scholarly reporting, it is obviously locked out as an available option
- by design and documented as so.

A screen shot does not describe your actions. *You need only
explicitly state that when you selected the mini-nec ground model,
that you had the NF button available and you selected it. *

To humor you, then... I explicitly state that when I selected the Real/
MININEC ground model, I had the NF button available and that I
selected it. The result of that analysis is included in the screen
clip at the link I posted, and which you seem unable to comprehend.

Also please note that I have already described and documented my EZNEC
model and actions in far more detail than you have done for yours, so
far.

Note further that the Demo versions of EZNEC operate exactly the same
as the paid versions, except for the number of segments permitted in
the model -- which was not a factor in the model I constructed. I'm
sure that Roy or someone else will correct me if that statement is
provably wrong.

The long and short of it is that what your poor model reveals is a
departure from the data found in *the BL&E paper *"Ground Systems as a
Factor in Antenna Efficiency." *You

1. *do not have a construction of radials of any type;

Their effect was included as I described in an earlier post. I will
understand if this concept evades you.

2. *do not have a radiator sized to their specification;

A 1/4-wave monopole is a 1/4-wave monopole, regardless of the
operating frequency. The intrinsic radiation envelope for a given
radiated power actually launched by such a monopole (e.g., apart from
the effects of the propagation environment) is the same at all those
frequencies.

If not, the FCC would/could not have adopted the results of the BL&E
experiments at 3 MHz as applicable to the entire MW AM broadcast band
(which they did).

3. *employ an engine (mini-nec) which is poorly suited to the task;

A MININEC ground itself is not an engine. It is a only a condition
used by the NEC engine.

4. *excite the model at a frequency not supported in data in BL&E;

See my response to your 2 above. In reality, surface-wave ground
losses in the MW BC band are less than at the 3 MHz freq used in the
BL&E studies, so the applicability of their findings is even more
relevant to BC operations.

5. *fail to note the documented advisories about near field operation
below 3MHz when such analysis is available.

No such advisory was presented by/in EZNEC during the process of
generating and analyzing my model.

I suggest you cool it for a while, and wait to see what Roy Lewallen
might post about all of this.

RF