In article ,
"David Eduardo" wrote:

"Telamon" wrote in message
...

Antennas can have a broader response by increasing the diameter of the
vertical radiator. This can be done by running at least three wires
around the tower 120 degrees apart with a ring connecting them together
top and bottom minimum. This is much cheaper than constructing a larger
diameter tower. Increasing radiator diameter to broaden the response is
a general rule that can be applied to most antennas.

Check http://www.davidgleason.com/Argentin...ransmitter.htm
for shots of the skirt we put on Radio 10, a 100 kw AM on 710 in Buenos
Aires. In addition, the station intentionally directionalized to send a
bigger signal over Buenos Aires by putting a 1/4 wave passive tower to the
NE of the main half wave tower. The effect was to increase the field over
downtown (mostly apartments, like New York) and to become the only
listenable AM in the market inside major clusters of buildings.

The skirt seems to have given good bandwidth, and sounded very nice.

Nice installation with near ideal earthing environment.

Good example of making the towers cross sectional area electrically
larger.

One reason the received audio is good is that besides being a well
engineered facility is the broader frequency response of the antenna
does not limit or phase distort the audio sidebands.

It must be very satisfying to build the matching device in the dog
house. You really have to pay attention to the physics of the capacitors
and inductors that makeup that device when it has to pass 100Kw.

--
Telamon
Ventura, California