Topband: Modeling verticals (fat, skinny, etc) on EZNEC

[Telegrapher9 at aol.com]

Rick,

that is a good antenna for 160 meters. I was thinking in terms of a 180 
degree dipole terminated into 50 ohms. Like we use for EMC measurements. To 
"calibrate" one of these in NEC I radiate it from a resonant dipole placed 100 
wavelengths away. Then some calculations and we we end up with a very accurate AF 
(Antenna Factor). In fact, once the AF is figured for one frequency all other 
frequencies are just a matter of calculation based on 20LOG(F/f). I forget the 
exact frequency, but an AF of 0 dB occurs at about 35 MHz. Based on this, the 
AF at 350 MHz is 20 dB. The signal at the antenna terminal is equal to the 
E-field in V/m minus 20 dB. 

    Dave WX7G