[BC] Long Island, NY Metro PCS Cables Cut
Phil Alexander
dynotherm at earthlink.net
Sun Dec 4 14:38:21 CST 2011
Not so much depending on ball gap setting and tower above and below
bonding point. In fact, unless the jumper is carefully crafted, wind
fatigue may be a greater problem than lightning.
A bazooka requires insulated hangers and grounding kits or, in the
case of rigid line, tabs preferably under the bolt heads of a joint
near the bonding point. So, tying all grounding kits together and
using a single jumper strap or bar should work without much trouble.
I always used one of those huge water pipe grounding clamps that
Andrew used to sell and clamped around one leg of the tower for my
"fine tuning" slider. It doesn't matter that both ends of the bond
are at exactly the same level, but I liked to keep them within about
three feet to reduce stress (from wind) on the jumper. Twisting helps
too. So does ***heavy*** 2-1/2 inch tinned copper braid with an end
for the line side and a clamp for the tower side to pull the excess
braid through. Just lucky I guess, but I never had one of those break,
although flat 2 inch strap was a different story, especially if it was
not twisted.
Phil Alexander, CSRE, AMD
-----Original Message-----
>From: Mike McCarthy <towers at mre.com>
>
>Those jumpers tended to get blown apart by lightning strikes.
>
>The other challenge surrounds adding lines. Because the tower's
>apparent face size would increase with more lines added, the base
>impedance would in fact change and require re-tapping the bonding
>straps. The more lines, the more wild things get. A tower full of lines
>(such as the tower referenced in this thread), I would argue the bonding
>aspect would be an absolute nightmare to craft a reasonable height.
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