Most of what you need is in the Rohn 25 brochure
http://www.rohnnet.com/filedownload/downloadfile/fileid/17/filenum/0/src/@random48eced0c124b9
It appears to me from the Rohn specs, most 40m 2L yagis are within its
capacity if properly guyed. Texas Towers and others can supply what
parts you need. If the top section is the one with the 2" id tube then
you don't need a new top section and the problem is how to get a mast
into a erected tower. You can put a shorty mast (5'-10') by armstrong +
gin pole but a 20' will take a crane or boom lift.
Did you do the original installation? If not, hire the installer
again. You might have wind exposure that warrants a PE analysis and
better guying than in the Rohn catalog.
The G1000 is asking for trouble rotating a 40m beam, IMO.
Grant KZ1W
On 4/2/2014 7:23 AM, Michael Warren wrote:
Problem: I have a Rohn 25 G tower that I want to use with a 40 meter yagi. I
know that the tower needs some redoing to get it in shape. I need the groups
expertise to guide me through this redesign.
+++The Rohn 25G is at 65 ft, and it was was constructed of new materials three
years ago. It is used only as an internet tower in a rural area to get above
the tree tops.
+++The base is buried in 3X3x3 concrete. The top section is pointed. There two
levels of small gauge guy wire. There is a 4 in gray plastic conduit runner
from the base underground to house.
++++I have a Yaesu G-1000DX A, enough 7/8 heliax to run the 300 feet down to
the shack
++++ I want to update this tower so that I can put a 40 meter yagi.
Things I suspect that needs to be done.
Put on a heavy duty flat top section
Obtain a mast
The 40 meter yagi - used, but in good condition from a contester. I have not
pickup this yagi to determine the make or model yet, or wind load. (Get it in
shape to use)
etc.
***Could I get some help as to the planning, the obtaining of parts, and
possess of construction?.
tnx 73
Michael Warren
KA5REJ
"I'm a old school teacher, and I can still learn new things!"
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