[TowerTalk] Attaching Large Antennas to Rohn-45 Legs
T A RUSSELL
n4kg@juno.com
Sun, 24 Jan 1999 20:56:43 -0600
A picture is worth a thousand words
so here goes:
(One, or) two pieces of horizontal aluminum channel.
End view of channel : |___|
Three vertical members, two tower legs,
and a short 2 (or 3) inch diameter piece of 1/4 inch wall mast .
Use two U-bolts at each attachment of the channel.
| |
| | | |
--------------------------------
-------------------------------- channel
| | | |
| | | | attach boom to mast plate for beam here
| | | |
--------------------------------
-------------------------------- channel
| | | |
| |
Leg Leg short mast
The "outrigger" mast allows the beam to be pointed where needed.
The channel spreads the load over 4 attachment points on two legs.
Space the channel approximately 3 ft (two steps) for one beam,
or more if two side mounts are desired (such as 10 and 15 M on
one tower). To minimize the torque load on the tower, place the
mast as close as possible to the nearest leg.
A ROTOR can be placed between the pieces of channel if it is
desired to rotate the side mounted beam. In this case, the
U-bolts on the upper channel need to be opened up to allow
rotation. This can be accomplished by putting nuts on both
sides of the channel, leaving a small gap.
If you do not intend to rotate the lower beam, a large
boom to mast plate can be mounted across two tower legs,
assuming the legs are aligned in the desired direction.
de Tom N4KG
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