[TowerTalk] OptiBeam OBDYA12-5 and NN4ZZ TiltPlate

[Art Greenberg]

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 at artg.tv

On 9/12/24 22:49, john at 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