[Elecraft] Re:Alligators and Bats
Ron D' Eau Claire
[email protected]
Fri Jan 11 14:47:00 2002
Stuart Rohre wrote:
>Broadcast stations are replacing expensive in the ground radials that
>corrode away with elevated radials as a cost saving measure for their
>quarter wave or loaded monopole installations.
>There is an AM station north of the plaza in Santa Fe NM, that has its
tower
>over a parking lot, and above the parking areas is a mesh of ground wires,
>all elevated radials.
Elevated radials work better too. If memory serves right, it's been about 10
or 15 years since some serious engineering effort demonstrated that the old
formula of 120 radials on the ground did not produce the best or the most
cost-effective ground system for short vertical radiators. A much smaller
number of elevated radials can out-perform the old systems.
I've read of a number of commercial systems being built or retrofitted using
the new data for both short wave and broadcast band antennas, but I've not
seen one yet.
How high off the ground are the radials?
Ron AC7AC
K2 # 1289