Lifting a lot of weight?
Rich L. Boyd
Wed, 18 Sep 1996 18:28:38 -0400 (EDT)
On Mon, 16 Sep 1996 K7LXC@aol.com wrote:
> In a message dated 96-09-16 00:28:24 EDT, you write:
> >I may be getting confused, but if this was the 20M yagi on 48' boom, I
> >think that's more than an "average antenna," and I'm personally not
> >surprised that one person (unless you're 200 pounds plus) might not be
> >able to move it.
> Hi, Rich --
> In my book, a 48' boom 20M antenna is not an average antenna. Might be
> standard for a medium to big gun but bigger than normal. And the 20M Telrex
> you mentioned is even BIGGER.
> >I have done a lot of single handed work here with the Telrex 6-el 20 (46'
> >boom, 175-200 pounds I guess), 8-el 15 (similar size and weight) and
> >homebrew 3-el 40, which I put up single handed but first the boom then
> >each element by itself. I find the maximum pull on a rope is like
> >ringing a church bell, pulling straight down on the rope, using all your
> >body weight to pull down. It's just possible to raise an antenna of this
> >class this way with one person. The hardest part is when you have to
> >hold its weight with just one hand while you use the other hand to tie
> >off the rope. I don't recommend it; it's at the limits of one person's
> >capabilities (or beyond).
> A device that will enable you to do this is used in mountain climbing
> circles and is called an ascender. It's used for ascending a fixed rope. It
> clamps on a rope, slides in one direction and locks in the other. In an
> antenna rigging situation, you install it upsidedown so that you can pull the
> rope down but it locks as soon as you let go of it. There are several
> manufacturers including Gibbs (I use this one), Jumar, etc. Check with REI,
> Northface, etc. for what they carry. Figure $30-50 for one.
> 73, Steve K7LXC
> TOWER TECH -- professional tower supplies and services for amateurs
The ascender sounds like a good idea. I think a friend of mine uses one,
I agree, anything on a 48' boom is larger than average. Someone referred
to an "average antenna" in a previous message. That's what I was
73 - Rich Boyd, KE3Q
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