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Old November 27th 08, 01:34 PM posted to rec.radio.amateur.antenna
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Default Low-angle Elevation Gain of a 1/4-wave Vertical Monopole


RC: Their paper reports by formula that I should see 194.5 mV/m. ...

RC: No? No what?

RF: No, the BL&E paper (accurately) stated that 194.5 mV/m is the
theoretical maximum field possible at 1 mile for 1 kW radiated by a
perfect 1/4-wave monopole over a perfect ground plane. The peak
values they measured came very close, but never quite achieved
that value.


RC: Are you demanding an exact accounting between measured vs.
modeled? If so, my model comes within 2mV/m of their graphed
data (which, in its own right, does not mean they actually measured
that particular cardinal point but as it encompasses their explicitly
stated variables is tantalizingly close enough).


If you are happy with the results of your modeling, then well and good
for you.

But the near-field value calculated by EZNEC and as shown in my URL is
far short of the result of the BL&E study, and also of the FCC's
propagation curve value for those conditions.

So far neither you nor Roy has suggested that the near-field analysis
I posted was based on an incorrect model, and there was enough
information about it in my clip to determine that.

BTW, a distance of 1 km from a 1 MHz, 1/4-wave monopole is no longer
in its near field, the boundary of which in this case is less than 150
feet from the monopole.

RF
 
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