Towertalk
[Top] [All Lists]

## Re: [TowerTalk] 43 feet pole for vertical

 To: towertalk@contesting.com Re: [TowerTalk] 43 feet pole for vertical K8RI Thu, 01 Nov 2012 13:57:45 -0400 mailto:towertalk@contesting.com>
 ```On 11/1/2012 7:03 AM, Pete Smith N4ZR wrote: ``````There *is* no such thing as simple trig, if your last brush with a cosine was 56 years ago! `````` I have to confess it's not been quite that long, but I'm only 72. <:-)) ```Actually I never took trig, which is quite a trick because I have a math minor. Try Calc II without ever having had trig. That was truly a self taught crash course in trig. And yes, I have to get out the book and look up the functions "just to be sure"...Now Derivatives and Integrals are something else. It'd take a few weeks review there. They told me I needed Calc. The last time I used it professionally ... was in school. Never did need it for work. ``` 73 Roger (K8RI) Fortunately, you can back this one out with ``````the old hypotenuse formula. Even I remember how to do that. 73, Pete N4ZR The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots at telnet.reversebeacon.net, port 7000 and arcluster.reversebeacon.net, port 7000 On 11/1/2012 3:35 AM, K8RI wrote: ``````On 10/31/2012 11:00 PM, Hans Hammarquist wrote: ``````I was wondering if someone has experience with a 43 foot vertical, mounted on top of a `````` tower. I used one before on top of my roof, but that one was supported with simple guy wires. Needless to say that is not easy to do if I put it on top of my tower (85 feet tall). Any suggestion? Maybe it is a very stupid idea? Guying at 80 feet is almost as simple as guying when on the roof. I assume the tower is solid so use the same anchor points on the vertical as you would on the roof. It's just the ground guy anchor points have to be farther out. It only takes some simple trig to calculate the length of the guys assuming the yard is farily close to level. Use single or doubly braid poly. 1/8" is strong enough to anchor about 3/4 the way up the antenna. If the tower is 80 feet and the antenna is 43 then 2/3rds of 43 is roughly 28.6 feet (give or take a foot or two) So the height is 80 + 28.8 is 108 feet. If the distance from the tower to the guy anchor is 80 feet then sqrt(108^2 + 80^2) and I don't have a calculator in there to run that last square root. I'd use double braided poly on the vertical and probably Phyllistran on the tower. However I think the 43 foot vertical is going to need radials so I'd use steel for those. I've done that with a 40 tower and 33 foot vertical and it worked just fine. I only used 4 radials but was pleased with the results. Course that was back in the late 60's until about 1980. 73 Roger (K8RI) `````` Hans - N2JFS _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk `````` _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk `````` _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk `````` _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
 Current Thread Re: [TowerTalk] 43 feet pole for vertical, K8RI Re: [TowerTalk] 43 feet pole for vertical, Pete Smith N4ZR Re: [TowerTalk] 43 feet pole for vertical, Gene Fuller Re: [TowerTalk] 43 feet pole for vertical, K8RI Re: [TowerTalk] 43 feet pole for vertical, Kelly Taylor Re: [TowerTalk] 43 feet pole for vertical, Rick Karlquist Re: [TowerTalk] 43 feet pole for vertical, K8RI Re: [TowerTalk] 43 feet pole for vertical, Kelly Taylor Re: [TowerTalk] 43 feet pole for vertical, K8RI <= Re: [TowerTalk] 43 feet pole for vertical, Mark Robinson