Topband: EIRP Measurement

[Rick Karlquist]

W2XJ wrote:

> This method is virtually universal for MW power measurement. There are
> calibrated RF ammeters available since they are required at each AM
> broadcast station (directional stations may use as many as a dozen
> depending on the array). Alternatively the voltage can be measured. In

Why is this method bulletproof?  So you measure the RF current, which
by the way is different below the loading coil than above the loading
coil.  How do you determine the radiation resistance of the antenna?
By modeling?  You have to correctly take into account tapering,
top loading, etc.  How do you know the counterpoise isn't radiating?

Rick N6RK