[PVRCNC] To K4WES

[Brian Alsop]

Wes,

Your e-mail system blocked my reply

Trying here.

I appreciate your problem. 

I depends to some degree on you mast material.  If it is the 2" Rohn heavy wall 
stuff, a bolt hole won't weaken it.
Wouldn't worry about shearing the bolt.  The 6M antenna just doesn't have that 
amount of torque.

If you have some height above the 6M beam-- perhaps 3 or 4' .  (add an extension 
of some angle iron if necessary.  The stuff with all the holes in it works 
fine)  Run some nonconductive rope or physistrand the top of this,  attach it to 
the 6M beam boom with a U bolt.   Run it down further to the boom othe tribander 
and attach it there.    The further out the 6M boom  you attach it,the better 
this will work..    It won't let the beam wander much.   A turnbuckle at the 
tribander boom might be a good idea to tighten it up initially.

The idea is to form a triangle.

No impact on beam patterns.

I've done this with my 30M rotary dipole in the stack on my HAZER.

6M beam is on another short Rohn 25 tower with a HAZER too-- about 35' up.   
Tower is attached to house for a short run of coax!

73 de Brian/K3KO

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> Hi Bill,
>
> I hope you are surviving the heat waves.
>
>
> Here is a problem I'm trying to figure out.  I currently have a Force 12 
> C-4SXL beam and I just bought an M2 6M5X beam that I'm going to stack above 
> it, about 6 feet.
>
> I have a 50 foot Hazer tower with the 18 inch face.  I have to be really 
> careful that either beam doesn't twist and turn a little off from the other, 
> or I won't be able to lower the beams ever.  Otherwise, I'd have to hire a 
> cherry picker and pay a few hundred dollars to get them aligned to be able to 
> lower the Hazer.
>
> The idea popped in my head not too long ago after thinking what happened to 
> Tom (N4TL) on his stacked Cushcraft beams that he showed the pictures to us at 
> the last meeting.
>
> Any idea on how I can keep both beams pointing in the exact same direction for 
> wind storms?  I know I could always lower it when big storms are predicted, 
> but that can be quite often and sometime wind storms appear out of nowhere 
> with no warning.  I'd hate to have to keep it lowered and only raise it when 
> using it.
>
> I don't want to overtighten the nuts and bolts attached to the boom and I 
> imagine the booms can always turn a few inches off from each other.
>
> I was thinking of drilling through the mast and putting through a nut and bolt 
> in it, but it can shear the bolt after a while.  Plus it might make the mast 
> weaker.
>
> So I'm thinking of putting some type of mini mast to connect the two booms to 
> each other to keep them aligned exactly.  I can put them on either side of the 
> tower a few feet away and connect them to each boom.  Do you think it'll 
> interfere with the performance of the beams?
>
> I guess I can find some lightweight aluminum tubing about 1" to 2" in diameter 
> and attach them to each boom.  It wouldn't add much weight. Does that make sense?
>
> Any other suggestions?
>
> Thanks a bunch and 73,
> Wes K4WES
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