[BC] Long Wire
Mike McCarthy
towers at mre.com
Fri Feb 19 22:21:10 CST 2010
I have a 160ft. skirt using the 3-#12 wire supplied by Nott. I'm thinking
the cable is not heavy enough. Then again, my members are 3" x 3" x 3/16"
angle with diagonal supports top and bottom. It's not going anywhere. If
you don't have 2" x 2" x 3/16" minimum angle, it's likely too light a
member.
If the angles are bending/flexing/deflecting, they're too light a member
and not properly supported. Period. The load presented between the 3-#12
Nott supplies and even a full 1/4" wire or even 5/16 is fairly
insignificant. We're talking about less than 1000 Lbs. tension overall and
not very much relatively speaking.
So...it sounds like the skirt was poorly designed. Especially for only
being 85ft.
MM
> How would I feed the tower? My unipole wires go up to about 85' and short
> out there. Really, the copperclad steel wires the engineer bought to make
> the unipole are too big and they are pulling on the angle iron crossarms
> at the top and bottom of the tower. The wires going up the tower need to
> be smaller, like what Nott, Ltd. uses.
>
> The slant wire would feed from the ATU to and attach to a certain point at
> the tower. One wire makes mores sense that three. I use a larger sixe
> Heliax up to the transmitter inside the building, the I go down to the
> 1/2" size feeding the transmitter.
>
> --
> Scott Bailey
> WMRO Radio, Gallatin, TN
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