Jim Brown wrote:
> On Fri, 09 Jan 2009 08:04:23 +0000, Paul Ormandy wrote:
>
>> Would be interested to hear any experiences or dimensions,
>
> A VERY rough approximation to get you to resonance is to view
> the sum of whatever wire is on top as being added to the
> vertical length. This will NOT be exact, and you should model
Actually, for a T-top, the approximation that is closest
is to add HALF of the top loading wire to the vertical portion.
For example, a 90 ft vertical with an 80 ft top loading wire
looks like a 90 + 40 = 130 ft vertical w/o loading. In
any event, it is trival to model in EZNEC and the modeling
has proved to be accurate for me.
Rick N6RK
_______________________________________________
Topband mailing list
Topband@contesting.com
http://lists.contesting.com/mailman/listinfo/topband
|