The sweet gum has more “wetness”. A lot of water. Pines are not, they are
gummy But as far as the 100 foot tower, the guy that put it up REALLY knew what
he was doing !!🤣Dan N4GNR
Sent from Yahoo Mail for iPhone
On Friday, October 1, 2021, 4:05 PM, David Gilbert <ab7echo@gmail.com> wrote:
All lightning is weird and unpredictable. There are countless stories
of lightning hitting something on the ground while missing a nearby
pole, tower, building, or tree.
73,
Dave AB7E
On 10/1/2021 12:32 PM, Ignacy Misztal wrote:
> My QTH has two sets of antennas. A 100 ft tower with phased beams at 100
> and 60 ft, also supporting 4 sq for 80 and shunt fed for 160m. Some 120ft
> apart, a Spiderbeam on a 45 ft aluminum Spiderpole and rotated by G-800DXA.
>
> Recently the rotator for the Spiderbeam stopped working. There is no DC
> output from the controller but the position indicator is OK. With
> external DC the rotor works. About 30 ft from the Spiderpole, a 60 ft high
> sweetgum tree exploded vertically. But an 80ft pine tree embracing the
> sweetgum is fine.
>
> Apparently the lightning hit the sweetgum and induced enough current to
> partly blow the Yaesu controller.
>
> A few questions to the knowledgeable.
>
> Why the smaller tree was hit and the bigger is fine? Why other trees up to
> 100 ft are OK? Why the 100ft tower shows no damage? Is the Yaesu controller
> vulnerable to lightning hits? Is it worth repairing?
>
> The tower is well grounded and the antennas by the house are bonded. The
> Spiderbeam rested on 4 ft metal poles and was not grounded otherwise
>
> Ignacy, NO9E
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|