I think as a practical matter, whatever transient suppression you do
at the entrance to the shack is going to be the same whether the
cables are laying on the ground, suspended 10 feet off the ground,
or buried a couple feet deep.
Not if the cables are coming off the tower 10 - 15' high unless one
has a grounded metallic "cable bridge" above the cables and connects
the cable shields to the bridge/tower where they leave the tower.
With cables exiting the tower some distance above ground, the lightning
protection at the shack entrance will be much more critical.
73,
... Joe, W4TV
On 12/8/2013 11:22 PM, Jim Lux wrote:
On 12/8/13 6:51 PM, Steven H Sawyers (na0ia) wrote:
Under ground is better for lightning protection. The feed lines and
control lines, need to go to the base of the tower, through a lightning
arrestor at the base of the tower), then to the shack. If they come off
the tower high, then they are at a portion of the whole lightning
potential.
Yes, but... You'd have to bury pretty deep to get them totally "out of
the picture" with respect to a lightning strike. It's not like the soil
is a perfectly conducting ground plane of metal that is a perfect
shield. I think as a practical matter, whatever transient suppression
you do at the entrance to the shack is going to be the same whether the
cables are laying on the ground, suspended 10 feet off the ground, or
buried a couple feet deep.
Elevated lines of any kind are subject to deer with antlers snagging
them.
Get em high enough and you worry about 8 tiny reindeer and a big sleigh
with a guy with a pipe..<grin>
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