My 100'Rohn 25 tower has a bottom guy set 3/16 EHS, middle guy set 3/16
EHS with 21-foot rigid fiberglass insulators on the tower end, and top
guys 6600 lb Phillystran with 15' of EHS at the bottom. I used the
larger Philly because I got it cheaply.
Anecdotally, before I changed out the top guys, my short 40M yagi at 107
feet was a disappointment. After, it worked (subjectively) much better.
73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.
On 10/10/2013 8:44 PM, Keith Hanson wrote:
I am in the process of putting up a 100' stick of Rohn 45G. Originally I planned on
standard Rohn guying - 3/16" for the bottom two guys and 1/4" for the top - for
Rev G. Does anyone have experience in leaving steel for the bottom two guys and
Phyllystran on the top? How about running 30' of Phyllystran at the top end of each top
guy - like an extended insulator? I am trying to minimize interaction with the various
wire antennas I'll hang from the tower and keep costs somewhat under control. I'll have
a 3el/40M option SteppIr for openers, but may change that at some point. Obviously I am
going to play with a bunch of wire - dipoles, inverted Ls, slopers, etc.
On a different note, another ham, WB9EDL, and I delivered some used 45G
sections to the Rohn galvanizing facility today - they are called AZZ
Galvanizing in Peoria. The cost should run approximately $45 per galvanized
45G section. I recently took down 90' of 25G that had been up for 34 years.
It was a used tower when I purchased if from a local ham and I hauled over to
Rohn to be regalvanized when I bought it. The tower was in great shape when I
took it down a month ago, just beginning to show some brown staining in
places; the leg interiors were still shiny bright. Re-galvanizing is an
inexpensive way to rejuvenate old steel towers. AZZ is also redoing my guy
brackets, equalizer plates, stand-offs, etc, basically anything except threaded
goods - bolts, nuts, turnbuckles, etc.
As long as I am posting - I recently helped put up 50' of 45G for another local
ham, AB9M. We had to spend quite a bit of time cleaning excess galvanizing
from new tower sections - the inside of the leg joints. We did a trial fit of
all sections on the ground and labeled each mating end of the towers so that
they went together the same way in the air. We did 50' in a single after noon.
I did purchase the Yellowjacket tower tool and it would have been difficult to
get the sections together without the leverage it affords in pulling tower
sections together. Also - we had one mismatched set of legs that would have
been a real trial without the leg aligner part of the tool. The tool really
worked well for us.
Original question - any experience mixing steel and phillystran?
Thanks,
KeithAC9S
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