Topband: Shunt Feed - Insulated Elements on Yagi

k1fz at k1fz at
Thu Dec 18 11:33:25 EST 2014

     One of the factors for arc over is the diameter of the tower and 
top support pipe diameter & length. 
  A really FAT 1/4 wave tower may have 1000 ohms at the top, while a 
skinny tower would have much more. 
  The higher the impedance, the higher the voltage to cause arc overs. 

On Thu, 18 Dec 2014 10:05:16 -0600, Joel Harrison <w5zn at> wrote:
Stan - For about 8 years, up until this past spring, my shunt fed tower
  > for 160 had a KT34XA (insulated elements, later upgraded to a KT36XA same
  > insulated elements) at the top and I never experienced any issue at all
  > running 1500 watts, even during a few contests where, as you know, you are
  > running "continuous" for an extended period. I've read discussion about
  > whether the coax should run inside -vs- outside the tower, mine ran
  > outside. 

> > Thanks...Stan, K5GO
  > > _________________
  > > Topband Reflector Archives -
  > >


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