[TowerTalk] Adding Expanding Foam inside boom

[jimlux]

On 4/26/18 1:31 PM, Kimberly Elmore wrote:
> In a similar vein, I'm helpingto rect an antenna in a relatively 
> inaccessible location and want to minimize element vibration. I have no 
> intention of tryingto fill each element with foam, but I've read that 
> securing a rope inside the element will prevent resonant vibration from 
> occurring. If this is true, will something like "parachute cord" do the 
> trick? It won't be exposed to eather, so UV deteriorartion isn't an issue.
> 

An even better way is to wrap the rope in a spiral on the outside.  That 
kills the wind induced vibration very effectively. (you see this on car 
antennas).

doesn't even have to be the full length.


http://preformed.com/energy/distribution/motion-control/spiral-vibration-damper