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[TowerTalk] Antenna loads for rohn 45

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Subject: [TowerTalk] Antenna loads for rohn 45
From: "Jim Thomson" <>
Date: Tue, 20 Jul 2010 02:26:27 -0700
List-post: <">>
Date: Fri, 16 Jul 2010 10:02:56 -0700 (PDT)
From: Terry <>
Subject: [TowerTalk] Antenna loads for rohn 45
Can anyone tell me what kind of antenna load I can stack on Rohn 45?

I am looking at 130' of tower with a 4 element (full size) 40 Meter at the 130 
foot mark but would like to stack 6X6 60ft boom
20 meter antennas one at 135 the other at 73". The phyllistran guys would be at 
43 86 and 129 more or less.  Would adding a 
4th set of guys make a difference?  then the would be at 32,64,96, & 128.  
Replay to


## Instead of a heavy duty rotor to turn the top 2 x yagis.. + 2 x heavy duty 
3" thrust bearings, plus 3"  heat treated  chromolly mast, + mast steps
... plus a  TIC ring [ with 2 x motor's]  to turn the bottom yagi , another 
option would be to use K0XG  rings.. and just rotate the entire tower ! 

## Then you could easily have 10-20'  of tower above the top ring.   If you go 
that route, you are better off to use 55-G,
or 45-G  with the solid legs.   A friend just installed 190'  of  55-G.. using 
4 x K0XG rings.... and has 25'  of tower above the
top ring.    I found  from the hill radio catalog, that rohn also makes ..'HD'  
45/55/65 G sections.    These sections are DOUBLE braced,
and are crossed in a ...'X' .   So you end up with not only the normal  .."Z"  
bracing, you also have an "X"  .     The 55-g-HD sections are heavier,
138 lbs   vs  100 lbs  for normal  55-G.      My friend used 3 x of these HD 
sections at the very top of the tower, from 160-190'.   The top
ring is at 165'.  The K0XG rings are unique.  they can be mounetd anywhere 
along the section... not just at a section splice point ! 

##  Rotor is massive.. and sits on the base pedestal.  You can turn as many 
yagi's as you can fit on the tower.   In his case, 14 x yagi's in all will be
installed along the length of the 190's of tower.      4 x sets of  3/8"  
polygon guy wire are used.   The new guy anchors used are 10.625" steel tubes
in a 5 x5 x 5 block  of cement.  Inside of each anchor tube is also full of 
cement. A rectangular steel plate is  welded vertically  to the 10.625" tube. 
The 3 x new anchors are 170' out from the base of the new tower.  

##  the only drawback  to the rotating towers... is everything is pointed in 
the same direction.

##  His previous set up consisted of  160'  of Rohn 45-g... and had 7 x yagi's 
on it.  A pst-61 on top.. turning a 40m yagi, with the 20m yagi above it.
4 x tic rings  turned 5 x more yagis.  

Later.... Jim   VE7RF     


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