[TowerTalk] 43 feet pole for vertical

[Gene Fuller]

For anyone who is "trig challenged",, pencil, paper and a ruler and using 
about 8 feet to an inch (i.e.1/8th of an inch to a foot) would probably work 
out close enough. Anyway, trig wouldn't allow for any (though minimal ins 
this case) sag and wanting to throw in a little extra for tieoff and 
handling.
Gene / W2LU

----- Original Message ----- 
From: "Pete Smith N4ZR" <n4zr at contesting.com>
To: <towertalk at contesting.com>
Sent: Thursday, November 01, 2012 7:03 AM
Subject: Re: [TowerTalk] 43 feet pole for vertical


> There *is* no such thing as simple trig, if your last brush with a cosine 
> was 56 years ago!  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
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>>
>>
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