[TowerTalk] Wires in trees

jimlux jimlux at earthlink.net
Tue Jan 23 08:48:34 EST 2018

On 1/22/18 10:24 PM, Steve Boone wrote:
> This is a topic that I have never seen addressed and Google has not
> revealed any similar situations:
> I am installing a quarter wave, 160m inverted-L between a 40' Ponderosa
> Pine and my tower. The first 30' of the antenna will run parallel to the
> tree trunk and through the branches. I am using copper coated wire for the
> element. I have four elevated radials at the 10' level.
> My concern is whether I need to worry about contact between the wire and
> the tree. With the very low humidity that we get during Colorado summers, I
> am wondering if there is a fire danger here.
> I will be running a 1.5 kW.

yes - high voltage at the ends of the elements is more than sufficient 
to cause sparks (through the insulation)

You're doing the high current part close to the tree, so that helps, but 
I'd make sure that the wire is supported so that branches don't touch it 
and stay clear a few inches (esp the dead needles on the tree)  The 
voltage is (at a maximum) a few kilovolts, so it's not like it's going 
to jump a 1 foot gap.

> Thanks,
> -Steve, W7WM
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