I am just trying to catch up with you folks on some of this traffic......we are out of control here making things and planning projects and trips........ Here is how I have seen it for the past few d
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Thu, 15 Jun 2017 05:56:57 -0400
Do you want a real, worst case scenario which gives you what to expect for a real wind load and should be sufficient for almost any situation / installation, or do you want a calculation that will gi
The core problem here is the ham consumer is not being given compatible and concise data from which to make an informed choice. There's only one way for antenna ratings and tower ratings to fully com
On 6/15/17 9:56 AM, JVarney wrote: The core problem here is the ham consumer is not being given compatible and concise data from which to make an informed choice. There's only one way for antenna rat
Sounds like a definite improvement.... Don't forget the caveat for the tower folks that needs to be included about feed-lines, control cables at al. An LMR-600 or 900, 1200, etc. feed-line is a signi
Jim Lux, Thank you for contributing to this discussion! I don't think we agree about everything said, but that is quite ok! All I intended to do with my initial post....was to remind those on this re
Jim Varney, I think you are describing the basic problem correctly! But, I think it is important to notice some possible caveats that do occur and are relevant to the discussion. Having only one maxi
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Fri, 16 Jun 2017 00:56:01 -0400
Just write a formula for the wind speed Vs height, which is more or less linear with exceptions with heavy woods and close by buildings. Do the same with crank-ups where ea section is a constant size
I concur. I neglected to mention that about flat vs. round elements. That's another factor that should be listed when specifying the antenna's rating along with the topo, exposure, speed, etc. factor
Author: TexasRF--- via TowerTalk <towertalk@contesting.com>
Date: Fri, 16 Jun 2017 08:01:39 -0400
Many of the commercial wireless internet antenna manufacturers specify their antenna loads as pounds or Kilograms of force at a given wind speed. This seems like a non-ambiguous way to handle wind lo
The below url pdf explains the 222-G spec in detail. http://www.towernx.com/downloads/TIA-222-G_Explained.pdf Vortex shedding is well known. Eles vibrate up + down like crazy, like 6 Inches in total,
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Fri, 16 Jun 2017 13:01:10 -0500
A common, easily applied, and often quite effective effective solution to vortex shedding that is causing element oscillation is a spiral wrap of a string around the element that is oscillating. The
This is a technique commonly used on the main cables of suspension bridges as well. Al AB2ZY A common, easily applied, and often quite effective effective solution to vortex shedding that is causing
Vortex shedding is well known. Eles vibrate up + down like crazy, like 6 Inches in total, in just a light breeze. Ask anybody who own a 204BA or any wilson product. Those swedged eles are a pita..an
t explains it but doesn't have all the various K factors, which in turn are from a whole bunch of tables. For instance 2.6.5.2 Velocity Pressure Coefficient Kz = 2.01(z/zg)^(2/alpha) Kzmin <= Kz <=
Patrick, I think all the antenna manufacturers are going to want you in their manufacturing facility to show them how they can do this for you and everyone else, at the same prices you all think are
Thanks Jim for contributing to this discussion, I know we are on the same page, with some others that get it..... ;-) Correct Professional and Amateur nomenclature can always get in the way of the ex
Hi Gerald, This is usually not very useful for most installations...... A K6OK has pointed out, with 222-G the wind pressure applied to the antennas are dependent on several site specific variables.
On 6/16/2017 11:34 PM, Kurt Andress wrote: Hi Jim, Thank you for you contributions to the discussion! How you may decide to solve some problems is not necessarily how I would chose to solve them....b
Dealing with improperly designed things is always quite entertaining! I appreciate all the efforts put forth to do this with antennas their designers did not understand, because they were office dude