Author: sawyers@inav.net (Steven H. Sawyers n0yvy)
Date: Fri, 21 Aug 1998 21:58:07 -0500
The limiting part of the Rohn standard installation in heights under a 100' is the guy strength. Keep the guy spacing around 25-30 feet, use the guy brackets - no torque arms - and use two top guys p
Why no torque arms? Also what do you mean by, "two top guys / anchor"? Do you mean double the top guys? Lee -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contestin
Author: sawyers@inav.net (Steven H. Sawyers n0yvy)
Date: Fri, 21 Aug 1998 22:46:06 -0500
They don't do any good and are a waste of time and money. I mean put a spreader mount or a "star mount" which provides two anchor points at the top of the tower for each guy anchor point. The two anc
Hi Lee, I think Steve Sawyers is referring to a TA25 Torque Arm Stabilizer, which allows for the attachment of 6 guys that terminate on the 3 anchors. This is a vastly superior torque stabilizer than
Thanks Kurt, But what I was wondering about was do you need that on a 100 foot R25? I know that Rohn specs are shaby, but they dont spec them for 100 foot. I've erected many towers and we build a bra
Hi Lee,Many towers work just fine without the TA25 assy. My opinion is that it depends on what antennas are mounted on the tower. The mass and size of the antennas and rotator acceleration/decelerati
Author: sawyers@inav.net (Steven H. Sawyers n0yvy)
Date: Sat, 22 Aug 1998 23:27:57 -0500
The problem is that there is no one simple formula - it is about 50 to 60 formulas and they all relate to one another. Generally on the shorter (less than 100 feet) you can safely increase the guy wi
Steve- There is a reference several of our more knowledgible tower Gurus have used that has been bothering me. I have seen the equation for dynamic pressure given as q= 0.004 v^2, with an attribution
Author: sawyers@inav.net (Steven H. Sawyers n0yvy)
Date: Sun, 23 Aug 1998 23:08:31 -0500
The actual set of formulas used in the EIA standard is: F = qz * Gh * [ Cf*Ae + SUM(Ca * Aa) ] qz = .00256 * Kz * (V^2) Kz = [z/33]^(2/7) 1.0<=Kz<=2.58 Gh = 0.65 + [ 0.60 / (( h/33)^(1/7)) ] 1.00 <=G
Author: sawyers@inav.net (Steven H. Sawyers n0yvy)
Date: Sun, 23 Aug 1998 23:23:28 -0500
I apologize to both you and the web. The book is Cable Structures by Max Irvine and it was published by Dover Books. The paperback version has the ISBN of 0-486-67127-5 It was originally published by