Date: Thu, 6 May 2010 12:08:54 -0400
From: "Mark Robinson" <markrob@mindspring.com>
Subject: [TowerTalk] Orion 2800
Will the Orion 2800 rotator fit through the side rails of the Rohn 45 or do
you need to cut/bend the rails. If it doesn't I might get the top base plate
BPL45G and fit it to a standard section 10 foot instead of getting the
special flat top section 45AG4.
Mark N1UK
## It should fit just fine. I have 2 x OR-2800's but don't use em on
rohn-45G. The distance from
base of OR-2800 to flat plate is 9". You may have to remove that 1/4-20 SS
bolt... and remove the
jumbo plate /mast clamp 1st. Then install the OR-2800..1st. Then stuff the
plate /mast clamp in
after the fast... then lower down onto mating splines.. then insert the 1/4-20
SS bolt back in...done.
## Total height of that rotor is 15"... which may be a bit much to easily get
into the sides of 45-g...
with out 1st removing the plate. IMO... it would be far easier to remove the
1/4"-20 SS bolt...
and separate the 2 x halves... VS removing 4 x 3/8" bolts.. and just
removing the jumbo 2 x piece clamp
from the oval plate.
## K7LXC is correct. That stock OR-2800 jumbo 2 x piece mast clamp will
eventually slip on any mast..
and chew up any AL mast. It will also rip the zinc off off any galvanized
mast. A far better replacement
is the mast clamps offered by K7NV... [ which are custom designed to fit the
OR-2800]. They come in 2"
or 3" variety. He can also make em for odd ball mast diams... like 1.9" or
2.875" or 2.5" etc, etc.
K7LXC also makes a OR-2800 replacement mast clamp.. all hot dip
galvanized.... for 2" mast only.
The small K7NV Prop pitch I have uses a similar mast clamp... this one for a
2" mast. The 2" mast
JUST squeaks into it. Just barely tighten the 5 x bolts.. and the clamp
pinch's the 2" mast a full
350 degs... it will not budge.
The stock OR-2800 mast clamp will handle any mast from 1.9" to 3.125". The
problem is.. the teeth
have hardly any surface area..and will not bite into steel mast. The 6 x bolts
will also eventually loosen
up too. The surfaces under both the head and nut of the 6 x 3/8" bolts is
uneven at best, and does not
provide a good bearing surface. My conclusion is.. a mast clamp can only be
made for one mast diam only.
later............ Jim VE7RF
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