[TowerTalk] Force 12 C49XR improving boom-mast attachment?
david feldman
wb0gaz@hotmail.com
Mon, 11 Dec 2000 08:27:11 -0700
<html><DIV>Force 12 C49XR (giant 3-band yagi) was installed on my tower (2"steel mast) this fall and has been working well. Elected at install time not to pin the boom-mast clamp to the mast as I didn't want to drill through the mast (there are antennas above it and I didn't want to risk the integrity of the mast.) Noticed last week that the C49 had rotated several degrees azimuth away from the others in the stack so I presume the clamp plate has slipped on the mast due either to wind or start-stop torque (I'm using a Prosistel "C" box which has ramp-down control but I don't know if it does ramp-down during manually controlled rotation or just during point-and-rotate.)</DIV>
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<DIV>Anyway, what are the issues around improving this? With only four saddle clamps around the mast it seems there is very little contact area, leaving a tendency to slip. I have not pinned the mast at the rotator either (the rotator's friction clamp seems much more robust with better contact area), as I figured that would be the mechanical "fuse" if there was a torque problem (saving the rotator itself.)</DIV>
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<DIV>Given the WX it's not going to get fixed until spring unless it begins freewheeling, so there is time to plan.</DIV>
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<DIV>Tnx,</DIV>
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<DIV>73 Dave WB0GAZ <A href="mailto:wb0gaz@hotmail.com">wb0gaz@hotmail.com</A></DIV>
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