[TowerTalk] EHS leads for Phillystran

[Grant Saviers]

An added observation is the preforms on boom guys can interact.  I 
notice this on my 10m 5 + 5 stack with swr a bit off.

These antennas previously used Nicopress sleeves on the Phillystran. 
Recently, I discovered this is a termination method ok'd by Phillystran 
up to 1/2", four copper sleeves per termination.  Optionally, wrap with 
#33, which adds UV protection for the Kevlar should any be exposed (I 
don't see any exposure on previous gen boom guys).  I also think the 
Nicopress results are better than using cable clips as there is 
immediate deformation of the plastic cover so the compressed sleeve 
bears on the kevlar.

Grant KZ1W

On 10/3/2019 6:36 AM, john at kk9a.com wrote:
> I am not sure how you know that the pattern was distorted but I think 
> this is a good practice Tim. My top homebrew 15m beam has a higher SWR 
> than the lower two - 1.4:1 vs 1.1:1.?? Just below the top antenna is a 
> Rohn 65 massive star guy bracket with six Phillystran Big Grips directly 
> attached.?? Perhaps insulating the guy would help.
> 
> John KK9A
> 
> 
> Tim Duffy k3lr at k3lr.com
> 
> I had a problem with just Preforms attaching to the tower legs connection -
> which caused distortion in the pattern of close mounted Yagi's. That is,
> Yagi's that were mounted only a few feet above a guy connection point. The
> VSWR of the affected Yagi would change with rotation and the effect of 
> three
> Preforms connected to the tower was confirmed with modeling. The solution
> was to use a bent pin shackle and an insulator right at the tower
> connection. You can see it in this view of the middle four element 40 meter
> OWA Yagi stack at K3LR:
> http://www.k3lr.com/2016/ring.jpg
> 
> Using insulators at the tower connection completely solved the pattern
> distortion and VSWR changes with rotation.
> 
> 73
> Tim K3LR
> 
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