[Antennas] Help needed in EZNEC model for trap dipole driven element

Wed Apr 6 09:30:27 EDT 2005

In my quest to modify a set of Cushcraft 15m traps to serve 12m duty (for a 
rotary 12m/17m dipole to place above my tribander), I've veered off into 
EZNEC land. Some study shows that I don't have enough information to model 
the existing trap.
I suspect I can measure the inductance of the coil accurately (have an TEK 
130 LC bridge) and can therefore calculate what the parallel capacitance 
must be, since I've measured the resonant freq with my Grid Dip meter. I 
don't know what figure to put in for the parallel resistance, 
however. Any rules of thumb?
Alternately, does someone have a decent model of a driven element of a 
cushcraft type driven element, that I could hack up?
Many thanks!
John K5MO 
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