On 9/25/2021 10:19 AM, Mike Smith VE9AA wrote:
For a little better access, I could've put the rope through a pulley, but
ropes tend to last longer if just going over branches around here....or so
it seems. Ropes and wires through (cheap) pulleys tend to break them.
I've experienced exactly the opposite with wires rigged in my tall
redwoods. Wires in these trees MUST be rigged with good pulleys and
weights to allow for trees swaying in the wind -- without that, the
first good wind will put those wires on the ground. My wires are rigged
with the support rope tied down on one end and counterweighted on the
other by about 95# of sand in a water bucket. I experienced that failure
about ten years ago when I didn't rig that weight soon enough after the
tree climber rigged the antenna. The wind came within a week or so, and
the antenna ended up on the ground. In 15 years, with 6-8 wires rigged
with pulleys and counterweight, I've had only one of them fall in a storm.
And here, rope rigged over a branch will eventually be worn through,
dropping the antenna to the ground. This, of course, strongly depends on
the trees, their structural characteristics, how high the antenna is
rigged, and so on.
73, Jim K9YC
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|