I'd agree. The bracket reinforces the tower section by connecting all three legs together so the entire tower section shares the guy loads, without the bracing welds to the legs having to do that job
Here's what I read in the posts I responded to Steve, SNIP Guy Bracket GA25GD Mounts to tower at any tower at any horizontal brace. Torque bars TB25D (not shown) Optional for use with GA25GD Did eith
The moment of inertia (I) of the two tubess can be added together as long as they have the same elastic modulus (I.E. both steel tubes). The bending stress formula F=MC/I calculates the stress on the
Hi Paul & All, While it is never dangerous to make things stronger than they need to be, it's good to know where the extra safety margin is coming from so we can know if we are really getting it. The
Hi Gene, The direction of maximum exposed antenna area, hence maximum force developed by the antenna on the support structure, is either with the elements or the boom broadside to the wind, whichever
Hi Guys, Ok, here's the main difference between what you are thinking and what K5IU pointed out is really happening. The resultant force on a cylinder inclined to the wind is ALWAYS normal to the axi
Hi Mike, The PVRC mount shown in CH 22 of the ARRL Antenna Book does this. But, I'd recommend that it not be left in place all the time. The mast-to-boom offset creates a ton of torque when the boom
Yuri, I'm sure Jim will take good care of you, he is very dilligent and provided me with excellent support during my 4 Square experience. Good luck with your project, I'm sure it will fall into place
Yuri, I'm sure Jim will take good care of you, he is very dilligent and provided me with excellent support during my 4 Square experience. Good luck with your project, I'm sure it will fall into place
Snip Snip And... One very cool thing about the new version is that it no longer zeros in on a local optima and stops. Brian made the new one jump off of the local solution and start over again somewh
Hi Steve, Yes, YS does a freestanding tubular vertical just fine. The only difference between it and half of a yagi element is the loads due to gravity which can easily be accounted for. I used it to
Hi Sylvan, I think your planned installation will exceed the tower rating. You have the wrong antenna areas for evaluating the tower. The Rohn allowable areas are projected areas (see Dwg C870484 R4
Ted, I agree with the recommendations to go with two dipoles on a common feed point. I have two 40/80 inverted vees like this, apex @ 45', one for each radio, and they work great on just about anythi
Hi Bob and all, Good comments from others about this. Information exists in the ON4UN and ARRL books. The coverage in ON4UN's is more complete. I recently did this on a silly little AB577 surplus guy
The ultimate antenna collection requires the ultimate tower. Look in the catalogue for the tower that carries 102.6 SqFt. -- 73, Kurt, K7NV -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Hi Greg, The Big Berthas may be the ultimate by somebody's definition. Maybe someone around here knows what the Bertha's are rated for, I'm pretty sure it not this much. I think one would start shopp
There are plenty of us out here! Thank you for the compliments! Remember to correct those figures to make them useful for evaluating tower loads. The 3 x C3 stack is 25.2 SqFt. The 2 x C31XR stack is
Hi Dave, Years ago when we were doing a fair amount of contesting at my Dad's place, W6KUT, we had some front end overload problems with our TS930's. The station had fairly good sized monobanders and
Several questions received about this one. The mod was actually 3 fold, and different than I remembered from 16 years ago. 1) replace jumper on Q93 with XZ-070 Zener 2) Upgrade PIN diodes D15 - D33 w
Happy Holidays Everyone, I think Tom's (N4KG) comments regarding the newer Rohn configurations being inferior to the previous ones are right on target. The only reasons for using a configuration with