That's probably true for ANY harness. Kinda like a bike or motorcycle helmet. If you fall with it, you will put tremendous strain on it. The idea is to never have to end up using the vest to break a
Howdy all, I am shortly going to be putting up my first real tower - 5 sections of Rohn 25. I plan on guying the tower with two sets of guys per Rohn specs. My question is about anchoring them. I hav
Where did you get the 8000 pound number? The specs on 3/16" guy wire from Rohn are 3990 pound breaking strength. 1/4" guy wire has 6650 pound strength and 5/16 guy wire has 11,200 pounds strength. So
I just looked at the Rohn website and saw a couple of things: 1.) I answered my question of guy tension: 400 pounds 2.) For 110 MPH winds on a 50 foot tower, you have forces on the anchor of 1480 pou
I don't think that's right. The Rohn drawing indicates 2 sets of guys tied at the same point and the forces shown are for what is on the guy rod itself. Now when you get to the larger towers, of over
In that case, I'd agree with you. However, I know where my water table is where I am going to be putting the anchors. In some parts of my back yard, my water table is literally about 2.5 feet from th
Mike, An interesting setup for sure. To be honest, with a guyed setup, you shouldn't need much of a base if you are on solid ground. I have been convinced by numerous people to use a pier pin assembl
I have a Speedstrean 5260 DSL modem. I don't have so much of a problem on 20M, but do have problems on 40 and 80 m. I don't have the problem at low power but only high power. One thing both of us mig
You can try MaxGain Systems (www.mgs4u.com) as others have pointed out. But why do you want to use a fiberglass mast? Are you planning on mounting the yagis with vertical polarization? 73, Jon NA9D -
Fiberglass booms are also used a lot by satellite folks who have circularly polarized yagis. A ham who is an antenna and microwave expert did some studies and modeling into whether or not the fibergl
Agreed. Of course, if the yagis are short enough, you can always mount them from the rear behind the driven element. 73, Jon NA9D -- Jon Ogden NA9D (ex: KE9NA) Life Member: ARRL, NRA Member: AMSAT, D
Since I am the guy that started this thread, I'll comment and give an update! First of all, I think the utility company anchors have much wider "threads" on their anchors than the ones I got from Roh
That's not quite correct. If you look in the ARRL handbook, you can find a lengths of cable that will be fine. In fact, the ARRL says that 25 feet or so is about the ideal length. As you get longer a
That's a very good point. After having done some serious racing on 40 foot yachts, I've been amazed at the forces on sails and hardware. I am amazed at the relatively small size of bolts and so forth
I had a chat with the Phillystran guy at Dayton. You have to use the EHS equivalent size. The breaking strength of the Phillystran is pretty much the same as the EHS. So for whatever size cable you w
I assume the jacket on the Phillystran is UV proof? Kevlar does not do well at all when exposed to UV for long periods of time. It gets very brittle. How well does the jacket protect. I also know fro
In my talk with the factory sales guy at Datyon, he said the reason for having a leader of steel guy wire is to prevent any abrasion or anyone cutting it, messing around, etc. He said that while they
Kevlar is a fiber. As such it has qualities different than steel. While its tensile strength is generally as strong or stronger than steel, it does have drawbacks. It can be cut with a knife. It tend
As a kid, we had bird feeders and the starlings would come and scare away all the good birds. I dealt with them with my BB gun! :-) Good luck. They are pests! 73, Jon NA9D -- Jon Ogden NA9D (ex: KE9N
What about ice? Yes, the copper tape and the servo motor are all sealed inside. But in those environs where it might get really cold, what if moisture condenses inside and freezes? What then? I hadn'