[HCARC] Fwd: Crank Over Rohn Tower

[W4wj at aol.com]

Gary...
 
A quick FYI...    DO NOT USE galvanized (water)  pipe.  I won't say 
anything more than that as it will get too
involved.  Aluminum mast is also questionable, especially  in longer 
lengths.
 
The CORRECT mast is chrome-moly or some such stuff.  Much  stronger.
 
For longer masting, like 24 feet, you want at least quarter  wall (1/4")...
 
 
73
Don
W4WJ
 
 
 
 
  
____________________________________
 From: qltfnish at omniglobal.net
To: hcarc at mailman.qth.net
Sent: 12/16/2012  4:01:49 P.M. Central Standard Time
Subj: [HCARC] Crank Over Rohn  Tower


I post on Homesteadingtoday.com and received this post the  other day.

"..My tower setup was 70 feet of Rohn 25 G tower , had a 3  element triband 
beam , HYgain 20-15-10 meters , and a 40 meter single bander  made by 
Cushcraft ! Mast was a 21 foot stick of 1 7/8's galvinized pipe x 1/8  in wall 
thickness ! 
.................The ENtire setup was A Crankover , I  used a 3500 pound , 
2 speed hand crank winch with 1/4 inch stainless aircraft  cable . I built 
my own steel "V" shaped brackets with a pulley attached .  People told me the 
tower would break in half because of the load at the very  end of the tower 
. But , I fabed a "Sway brace" made from Standoffs and a  steel cable that 
ran the full length of the tower with a turnbuckle anchored  at the base . 
Once tightened the the load at the end of the tower was  transferred down to 
the base and the tower became a Rigid digit . IT was SO  strong I could Hang 
off the mast when I had it crancked almost all the way  down which was 
about 200 lbs ."

My neighbor wants to get rid of 4  sections of Rohn tower if I can find 
people to take it down - safely.  I  wonder if those 4 sections could be hinged 
and dropped like he  indicates.  It sure would be easier than climbing a 
tower to change  antennas.  I assume his sway brace was a cable that was 
attached at the  top and ran up and over a stand off at about the 20 foot level 
and then  attached at the base so when tightened it stiffened the tower.- 
maybe one on  each side of the triangle.  I asked him to send me a picture or a 
 drawing.

Gary J
N5BAA
HCARC Secretary  2013
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