[TowerTalk] Rohn RSL tower - slightly off topic

k7lxc at aol.com k7lxc at aol.com
Thu Jun 6 12:38:25 EDT 2019

>  Hello-? ? I was at a friend's QTH recently viewing his new Rohn RSL100L10, a 100' self supporter put together with 10' sections R-10H through R-1. It is rated for 25 ft/2 wind load at 90 MPH, dropping back to 11 ft2 at 100 MPH. We were discussing his planned installation of a KT-36 and M2 3 ele 40 meter yagi. He wishes to have the KT-36 about 15' above the tower top plate with the 40 meter yagi approx. 1' or 2' above tower top. Both antennas are fairly close in weight (approx. 95#), boom length (36') and wind load (10 ft2). ? I wanted to get opinions of folks experienced with large antennas and self supporting towers if this planned installation is OK for this tower.
Hiya, Byron --
    The proposed configuration sounds good to me but I'm not offering an answer to your question. What I am offering is a tower technique that I highly recommend.

    Install the antennas on opposite sides of the mast. That way many of the wind vectors cancel each other out. This was determined by Dick Weber, K5IU, a PE and the article appeared in QEX years ago. Anything you can do to reduce the wind induced torque on a mast is a good thing. Did I mention this is highly recommended?
Cheers.Steve    K7LXCTOWER TECH   


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