[TowerTalk] Rotating a dipole on a side-arm

Scott Honaker scotthon at pilchuckvet.com
Tue Nov 24 15:15:18 PST 2009


Our county is building a new Emergency Operations Center and tower.  We 
have had notoriously bad luck with our roof-mounted wire HF antennas.  I 
have been considering using an HF multiband dipole (like a SteppIR) on the 
tower.  There will be a microwave video downlink at the top so I am left 
with a side-arm mount.  I see the Tessco catalog lists 72" side-arms.  

The next question is how to I rotate it and not whack the tower.  I need a 
rotor or controller with adjustable stops.  Does such a thing exist?  I 
can't trust simply marking the display with a "don't turn here sign".  The 
rotor needs to not go there.

We expect to use a free-standing 3-legged tower so I anticipate I can get 
at least 90 degrees of rotation.  That should let me cover any bearing and 
hopefully let me reduce the effect of local noise.

What should I be considering?

Thanks,

Scott N7SS



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