[TowerTalk] ROHN 65-G where do we get 200' of it.. + mating gin-pole ?

Jim Thomson Jim.thom at telus.net
Wed Feb 17 05:10:07 PST 2010


A buddy of mine needs  190-200' of Rohn  65-G.. and pretty soon.   He would like to  use the 10'  sections , and not the 20's... if 
at all possible.  The plan was to use   3-4 x  KX0G   rings  +  KX0G base rotor.    Also, 3/8"  Polygon  rod  guy wire  to be used.

Top ring was to be at the 165'  level.. and have  25'  of UN-supported  tower above it.  [ or guy at 175'.. and have  same 25' un-supported portion above top guys] 
  On that  25'  of Un-supported portion, a 2 el  80m  yagi [ M2]  was to be installed, along   with a m2 4 x el  40m yagi.. and also a 5 x el 20m  m2 yagi. 

Lower down, the plan was for  a 2nd  4-el 40m yagi... and also  TWO  more   5-el 20m yagi's... and also single yagi's  for 17-15-10-6m.

IE:   10 [ TEN]  yagi's  in all.    Will  65-G  take this kind of load ??    Max wind gust ever recorded in the last 10 x yrs at this location was 57 mph [ at the 160' level of another tower] 

In looking through old Rohn catalog I have..... the "safe moment of restraint" is :

45g-  9610  ft lbs     aprx $269.00  per 10' section
55g-  17,160  ft lbs  aprx $319.00  per  10' section
65g-  33,200 ft lbs   aprx $365.00  per  10' section 

Seems to me that's a huge diff, between  45 g and 55g... another huge diff, between 55g and 65g . 

The game plan was to opt for  65-G.... if we can find some... new.  The gin pole is what's  giving us the run around.  Any idea's.... or general notes with 65-G owners would be appreciated.  EG; install procedures unique to 65-g .. pitfalls.. 'gotcha's,  etc.    

Per Rohn book, 3 x sets  of guys  are required.    But this is a wicked load.   4 x sets of guys can be used, if required . 

Later......... Jim   VE7RF





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