On 2/1/13 1:36 PM, K7LXC@aol.com wrote:
Howdy, TowerTalkians --
I'm researching temporary antenna installations (like Field Day) and
was wondering if you have some input. What did you use? How did you erect
it? Materials? Hints and kinks?
This is with an eye towards safety and effectiveness. I don't need
real specifics (like what antenna to use) but general thoughts and
considerations. Tnx for any input.
Temporary guys.. We've used static line (non-stretchy kernmantle rope)
to guy a tower trailer as well as a "iwo jima" erected 20 foot (two
sections of 25, I think). I don't know how good it really is if the
wind comes up, especially because the anchors are something like steel
t-stakes.
For myself, I've recently been fooling with one of those 40 foot carbon
fiber collapsible masts. It works pretty well (albeit a bit bendy at the
top), but you need some way to support the bottom upright, particularly
during erection. In any case, it nicely supports a couple inverted Vs
at right angles which also serve as "quasi-guys".. I do expect it to
collapse in any decent wind, but the wires and nylon cord (mason's twine
in nice visible dayglo colors) do help prevent it from waving around.
I run a tuner at the base, and RG-8X up the mast. Velcro works very
well to hold the wires to the mast as you erect so they're not waving
around. I have given serious thought to a sort of improvised open wire
line.. basically bring 4 loose wires down the side roughly distributed
evenly. Who cares what the Z is, because the tuner will take care of it.
Some years ago I was trying to build a field deployable phased array
made with 4 verticals using collapsible fishing poles (20 foot from
Cabela), but I don't know that it gives enough performance improvement.
I think the extra height from the 40 foot pole and using the crossed
dipoles to form a null is as effective.
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