I asked MFJ if I could buy just the HDR-300A controller since I saw the HDR-300A on their Hygain web site. Here's their reply. Kris N5KM http://www.hy-gain.com/hy-gain/products.php?prodid=HDR-300A Li
Michael: My handi-dandi black magic spreadsheet tells me that if the guy point spacing on Rohn 55g is 40',i.e., guy poinst at 40', 80' and 120'. The maximum axial capacity of the 55g is 43,500 pounds
Pete: As far as I can determine there is nothing else involved. The rule of thumb is just that a rule of thumb. It is probably a value erectors used and it seems to work. There is not hard and fast s
Steve: Tnx for the suggestion. I've got a friend in Houston that has an extra base and I'll try to persuade him to let me borrow it for a while and have an extra base made. I should have bought an ex
All: I promise that this is it for me on this thread. I would like to thank all that provided input concerning my post. You made me revisit my resources and undergraduate references to form a reply t
Brian: Ice is very strong in compresson but has low tension shear strength. IF your base is iced over and has enough torsion to cause it to move it will move. I don't feel the ice would be a problem
Sylvan: Reread the footnote again and look at the context in which it is invoked. It is only for the triangular tower section if they are round instead of flat plates. Antennas and rotators fall unde
Time Out everyone: All this talk about integrating and double integrals has given me a head ache. As defined in the Building Code I know the most about ( the UBC), the surface area exposed to the win
Okie Doke Pete: Lets get to know the alloys and treatment. 6000: (6061) A silicon and mangnesium alloy of aluminum. Heat treatable very versatile with good formabliliy and corrosion resistance, mediu
OOPS is my face red. 7075 alloy is not recommended for welding by fusion methods. Resistance welding spot and seam of may be readily accomplished with clad material in T6 condition. Resistance weldin
Brian: The 3" clearance is not a recommendation that did not initiated with ROHN, it is a part of the ACI 318-99 Building Code for Concrete, which is adopted by all the building codes in the United S
Steve: I'll be at Dayton... Wouldn't mind helping again like last year.. No charge... just entrance badge... Unless I pissed off some customers last year.. Hank / KR7X List Sponsor: Champion Radio Pr
Bruce, The National Electrical Code requires all conductors within a common raceway to have the same voltage rating. However I agree with Tom and use an extension cord, with No. 12 or 10 conductors.
Jerry, I would not worry one bit about the C31XR. I have only had mine up for two weeks but I have never been happier. I also have an A4 up 80 feet in a tree which I have worked 327 countries with an
Jerry: Well now, I am a structural engineer and you are going to get this for free..... Guy the 74' tower at 35' and the top. Rohn shows the top guy lower to allow for horn or dish antennas at the to
To all; It seems this came up a year or so ago. I any event I dug out my typical tower simple FEA Model and revisited the results. The model assumes a 70 foot guyed tower. It is guyed at 35' and 70'
Brian: Actually the rebar cage in either is the same. It should be separate from the tower section that is embedded in the concrete. I would not recommend to anyone that they use the embedded tower s
Hi folks, The only people I ever knew that died from exposure to RF were people who spent all their working days, up until retirement at 50kw broadcast sites. They all died of alcoholism, not of leuk
I keep getting these messages. I do not have any way of helping. Maybe some of you have a way that you can be of help. This guy, who calls himself KFC, has been driving these people nuts for some tim
Though this has nothing to do with a tower that has beams antenna on it, I does remind of a broadcast station that painted all their tower sections, in pieces, on the ground. They had a heck of a tim