I had good success with a 160/80 elevated GP in Vermont.
The lower 63' of the antenna was made from 450 ohm transmitting
open wire line. The top was #12 insulated superflex.
I started with 68' of OWL, and gradually trimmed it down to reach
resonance. It was fairly low Q, for an elevated GP. 3:1 @ 3.5
and 3:1 @ 3.8, and 1.5:1 for 150KHz in the middle. Four radials
per band, each 5% longer than the radiator.
If you were to make a phased array of them, you'd want to work out
matching for 80/75. A slightly more complex structure, with a third
wire would give you a double humped response.
N2EA
jimjarvis@ieee.org
_______________________________________________
Topband mailing list
Topband@contesting.com
http://lists.contesting.com/mailman/listinfo/topband
|