[BC] Elevated vs underground systems

[dhultsman5@aol.com]

In a message dated 2/13/2006 12:54:38 AM Central Standard Time, 
dpuopolo at usa.net writes:
On 12 Feb 2006 at 7:54, Stanley Adams wrote:

 > What is the theoretical disadvantage in using the elevated over the ground
 > based system?

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Stanley:

I believe it is mentioned in LaPorts book regarding the WTBS station 
in Shreveport where they had it due to flood plain and keeping the 
array stable during standing water.

At the old KLIF, 1190 kHz. in Dallas bot the original AM 5-tower and 
the present daytime site had counterpoise ground systems due to being 
in the flood plain.  water could come up and as long as it didn't go 
over the counterpoise we had onlay a slight change in parameters.  I 
didn't want to know what the field was doing on the original night as 
I was pretty sure ot would go out but our parameters stayed pretty 
close unit the water reached the top of the counterpoise or went over 
one of the base insulators which required us to go non-d with a 
maximum of 250 Watts with FCC authority subject to no interference complaints.

Maintenance on these units we a real problem.  The radial wires 
started at the base insulator atop the tower pier which varied from 
12 feet to 6 feet above the ground.  The radials extended outward 
across an angle iron support frame which was about 20 fet in diameter 
aroudn the tower in an octagon and supported the doghouses. Each 
radial went over the top perimeter edge and then down to the ground 
and was plowed out to the quarter wave length.

Keeping weeds, trees and floating debris was a problem.  Everytime we 
had a flood the soil would gown many new types of weeds and trees as 
the flood woulf wash away any weed killer and bring in new dirt and seeds.

The daytime 1190 site still has four towers with counterpoises.

Dave