Topband: Spiderbeam pole

[Richard (Rick) Karlquist]

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