[TowerTalk] Have you had success with ....

[jimlux]

On 7/20/19 6:46 PM, john at kk9a.com wrote:
> I used to have a 20m Hy-Gain beam in addition to my stack of homebrew 
> Yagi's.  I used no rope and it shed element tips constantly. I am not a 
> mechanical engineer but I believe the tips break because they are made 
> from very thin walled tubing and are attached to a much stiffer swedged 
> aluminium tube instead of using a more gradual element taper.


Or it just happens to be a bad choice of relative mechanical resonant 
frequencies - imagine if your dominant aeolian shaking is at 1 Hz, and 
the tip happens to be resonant at 1 Hz.  the main element might only be 
moving a few tenths of an inch, but the high Q of the tip means it's 
moving 10 inches.