John,
When the mast is vertical, the boom plate on the TiltPlate is a few
degrees off of vertical. So if you just bolt the square boom to the boom
plate, the antenna will be off of horizontal. The adaptor allows for
adjustment of the boom to make the antenna horizontal.
This isn't a problem for a round boom.
--
Art Greenberg
WA2LLN
art@artg.tv
On 9/12/24 22:49, john@kk9a.com wrote:
I have never seen a NN4ZZ TiltPlate but I just looked at some online. To me
it looks like you could just mount the square boom directly to the plate,
not sure why an adaptor is needed. The OptiBeam comes with square U-bolts
to mount the boom. I believe that they're 6mm diameter. For my 4el 40m
OptiBeams, I also added 3/8 diameter square u-bolts for additional strength.
You may have to shim the plate's bearing so the plate lays open perfectly
vertical. ON4AMG has photos of his OptiBeam and Tiltplate that may be
helpful:
http://www.nn4zz.com/customer_pictures_and_comments.html#GUY_/_ON4AMG
John KK9A
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|