[TowerTalk] Re: Long mast, intermediate bearing

Stan Griffiths w7ni@teleport.com
Sat, 18 Apr 1998 02:08:20 -0700 (PDT)

>>Here, let me do it for you.  I will not include any pieces such
>as the
>>rotator mounting plate that are common to both situations:
>>Situation #1:  Pipe top with 18 foot mast and rotator at
>junction of the
>>bottom of the top section and the top of the section below it.
>No thrust
>>25AG3 Pipe Top = $106.86
>>Situation #2:  Flat top with 18 foot mast, thrust bearing, and
>>shelf to keep the mast vertical with the rotator removed.
>Rotator mounted
>>same as in situation #1, above.
>>25AG4 Flat Top = $119.34
>>TB3 Thrust Bearing = $75.66
>>AS25G Shelf = $32.45
>>Total = $227.45
>>So the flat top and thrust bearing are an additional $120 or so
>for no
>>improvement in performance or safety that I can see
>Good piece.  Lots of good info.
>Does the pointy-top come with a rotor plate?
>If not, then it's an $88.14 difference.  For most folks putting
>up a second or third tower, that may insignificant, especially if
>their other towers are flattops (consistency in construction,
>esthetics (all look the same), etc.).
>dale, kg5u

Hi Dale,

The pointy top does not come with a rotator shelf, but the flat top needs
TWO of them.  One to mount the rotator on and the other one to provide a
support point to keep the mast vertical while the rotator is on the ground
being serviced.

Stan  w7ni@teleport.com

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