supporting Isn't that the other way? stress Clear as a mud :-) Old wives tales. It's mechanical structural engineering 101, and also some street smarts. Regards, Yuri Blanarovich, P.Eng, M.Sc., K3BU,
Right on Bud, just consider masts on the sail boats. If guying it was so wrong, you would not see the masts reinforced with 4 way guy wires that start at the same point at the bottom, are spread out
Master's degree in mechanical engineering. Designed few bridge, crane and tower structures plus Razor antennas that stayed up in Canadian winters. Would that deflect some mud thrown by those unenligh
guyed load. That is the example of wrong blanket statement. Force induced by guy wires is fractional from the forces that self-supporting tower is experiencing when alone. Again there is no need to t
Imagine this: You live in Florida, you have perfectly designed antenna/tower system rated for 90 mph winds. Normal situation. Then you hear that huricane is coming at 210 mph. What will YOU do? Pray
to Herr TT Administrator. As far as I am aware I tried to present some reasoning based on engineering knowledge. If you or anyone wants calculations for a specific design or situation, you can contra
The 'properly' was put in to avoid smart alec situation by someone putting guy wires on 100ft tower at 10ft off the ground and trying to snatch the purse. Implies reasonable situations like lets say
If the fleas will not go away, what's elephant got to do? Seems some reasons are presented, so I will try to engage one more time. I hope it is shining some light on the problem and will save someone
Chuck, Have a look at: http://www.c-conceptsinc.com/index.html C-Concepts has excellent page, slide presentation, engineering software that can be used for 30 days (cost over $5k), bunch of examples
Risking being unsubscribed, I respectfully disagree. After looking at the pictures, without knowing material and sizes of tower members I see the potential problems: It might be nicely made by the to
What bracing? There is none in the pictures. The bottom legs are made of 3 inch heavy Are all sections moving out at the same time? Lower section is pulling out next one? I have made a small piece of
Looking at the pictures, that is not the best way to join the tower sections. Better way is to have legs being bolted together, either overlapping or using sleeves to overlap both legs. If you want t
You would have to use steel frame, not just rebar. Figure out the volume and yoou will see that you are not gaining much in digging. In areas with frost, bad idea. You have to get below frost line. T
Hi Joe, can you elaborate on agreement between software designs and actual antennas? VHF antennas allow close verification and measurements. Yuri, K3BU
Hi Joe, thanks for the info and encouraging news about correlation with real life (2m) models. Yes, it is interesting how many possible solutions there are within the antenna design, and how easy it
But if you try to squeeze juice from them, and that's what you are looking for, then answer is very simple. :-) What you mean apples and oranges? I thought we are talking about apples (Yagis) and app
Quad-Yagi & VE3BMV designed Razor (Quad/Yagi) beams on 2m antenna range 30 years ago and optimized them for best pattern (F/B, F/S) - gain compromise and 50 ohm impedance. The best quad design is 3 e