Topband: Monopole Radiation Patterns, takeoff angles etc

[Paul Christensen]

> And your point is ?? That is not the only place where substitute
> arithmetic will produce a
> different figure.

I ran a 4Nec2 (with NEC/4.2 engine) surface wave plot for a 160m 1/4-wave 
vertical radiator over a
field of 60 radials with average ground conductivity.  Input power = 1.5KW. 
4Nec2 was first set to analyze field
strength at 10 km or 60 wavelengths on 160m.    That's way out there...

http://72.52.250.47/images/160m.jpg

Next, I ran a simulation of the far field plot for the same radiator:

http://72.52.250.47/images/160m-1.jpg

The far filed shows zero field strength at zero elevation.  By contrast, the 
surface wave analysis shows that the field strength never drops below 12.2 
mV/m at any elevation, including zero elevation.

I'm just the messenger....

Paul, W9AC