[TowerTalk] or2800 m2 rotator into Rohn 25 tower

[Jim White, K4OJ]

I have not installed one of these...but it sounds like it might be a 
candidate for installation at the top of the second section of tower 
down... the top of the section is the tapered end of the tube and the 
bottom of the top section has approximately five or six inches before 
the first horizontal cross bracing starts at the base of the section.  I 
am not at the station otherwise I would measure it for you...

This short vertical window of opportunity before the bracing starts up 
may be what you need for the corners of the triangular motor casing to 
sneak outside the tower's cross section.

I have used that location many times with a long mast - you have to 
install the rotor before the top section so to speak... if you ever have 
to service the rotor you will probably have to saw the cross bracing and 
will need to substitute a "patch" to make up for the loss... by choosing 
this location you have picked the least destructive point to cut a cross 
brace since a regular cross brace is roughly every 15 inches so cutting 
one of those in the middle of the tower section would result in a 30" 
(prox) distance between intact horizontals, call it five inches from the 
bottom of the section up for that cross brace and you will have about 
20" without a horizontal cross brace...

Yes, it will require a very long mast but if you are stacking this can 
be a big bonus as far as mechanical advantage.

Not a P.E. just an antenna farm owner who has had to saw a cross brace 
while in the air before - not fun! Back to building yagis...

Jim, K4OJ


Craig Miller wrote:
> Steve
> 
> As per M^2's Orion 2800PDC manual:  "The Rohn 25G tower is the smallest that will 
> accept the OR-2800PDC positioner and only in the  top section that tapers into a 
> mast guide-tube.  The positioner cannot EASILY be installed in any other part of the 
> tower."
> 
> If additional questions, call Wyatt  Lyzenga at M ^2 in Fresno (559.432.8873 Ext 15)-  
> he's very helpful and incredibly knowledgeable.
> 
> "Wyatt Lyzenga" <wyatt at m2inc.com>
> 
> 73 and GL, 
> 
> Craig
> WA6OXK
> 
> 
>>What are my options on putting the or2800 into a Rohn
>>25?  When I bought it, someone there said I had to
>>remove a cross brace.  If I do that in a regular
>>section, will the rotator fit?  Appreciate hearing
>>from someone who did this and what options are 
>>available for me.  I want the rotator lower for the
>>long mast I will use.
>>73 K7AWB Steve Spokane Valley, WA
>>
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> 
> 
> _______________________________________________
> 
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
> 
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