[TowerTalk] elevated guy posts

SGTOKIE at aol.com SGTOKIE at aol.com
Wed Mar 3 18:16:57 EST 2004


I used elevated guy posts because of area problems as well.  my tower 
installation is on a rohn 25g at a total height of 60 ft.  i use 3 sets of guys @ 20' 
40' and the top at 60'......i know that is overly cautious but i was unable 
to spread guys to 60% of the height....my antennas are:

cushcraft 13b3            1.8sq/ft               68'   
cushcraft 6176b          4.8sq/ft               60'
cushcraft 719b            1.2sq/ft               65'
2-2m big wheel            1.0sq/ft (apx)      55'
2-6m loop                   1.0sq/ft (apx)       55'         
2-70cm loops              0.4sq/ft (apx)       55'
10m sloping dipole      0.2sq/ft (est)        50' 
40-20-15-10m dipole    0.5sq/ft (est)        50'         
80m inverted vee         0.8sq/ft (est)        55'         
discone scanner ant    0.5sq/ft (est)        45'
                                12.2sq/ft apx

1-7/8" hardline
2-1/2" hardline    
3-RG-213     
1-RG-8X
1-remote coax switch @55'
my 235lb fat butt (sometimes)

Rohn gives 10.2sq/ft at the 60' level with 2 sets of guys at 55' and 28' 
levels and allows 1 5/8" feed line on each leg for 90mph wind velocity and no ice.

if i assume the maximum, then i have exceeded the design, however, i expect 
the dipoles to fail with 1/2" ice and therefore reduce the total top load to 
10.7sq/ft.  still puts me 0.5sq/ft over the allowable max top antenna load but 
there is  2.4sq/ft at the 55' level and 0.5sq/ft at the 45' level......I am 
pretty sure i am in the ball park area of having a safe tower installation.

de kd5qwo, david howard


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