[BC] Conductivity vs Skywave
Richard Fry
rfry
Sun May 15 14:23:00 CDT 2005
Peter Haas:
>195 degrees, the average over all U.S. ND-U Class As, gives
> about 400 mV/m/kW at 1 km. A Franklin gives about
> 510 mV/m/kW at 1 km.
By your numbers (and mine), a Franklin produces 2.1 dB more field strength
in the horizontal plane than a 195? radiator. As I posted earlier, this may
not be enough difference in groundwave field at the receiver/listener level
to justify the costs needed to install and maintain a Franklin.
BTW, from data I checked the average radiator height for all U.S. ND-U Class
As is about 188.8?.
>As the horizontal field increases with height, the vertical field
>decreases. Then the vertical field begins to increase again at 180
>degrees.
This depends on the radiator height and elevation angle being considered.
For example, radiators with heights between 180? and 225? have less
elevation (vertical) field than a 180? radiator at elevation angles ranging
from about 15? to 50? (all over a perfect earth).
RF
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