80m Vertical over lossy soil
wrote
The only problem is I see no direct comparisons to a normal set
of buried radials. Only that they were able to meet the "minimums"
required by the FCC. I would be curious to see how well the 6 radial
setup would compare to a non crippled set of 120 radials.
It's interesting, and I'd already seen it, but I'm not really convinced
thats it's equal to 120 radials in the ground.
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The FCC minimums depend on the class of AM station.
1) 362 mV/m/kW at 1 km for Class As (equivalent to 225 mV/m/kW
at 1 mile for Class Is),
2) 282 mV/m/kW at 1 km for Class Bs (equivalent to 175 mV/m/kW
at 1 mile for Class IIs and Class IIIs), and
3) 241 mV/m/kW at 1 km for Class Cs (equivalent to 150 mV/m/kW
at 1 mile for Class IVs).
The groundwave field of a perfect 1/4-wave monopole over a perfect ground
plane is about 313 mV/m at 1 km for 1 kW of applied power.
RF
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