[TowerTalk] 43 feet pole for vertical

[Pete Smith N4ZR]

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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