[TowerTalk] Spacing between Antennas

[Edward Sylvester]

Thank you for all your input thus far.  I just want to clarify that the heaviest duty materials are being used.  The UST 689 is rated for a gazillion sq ft and the 3" chromally mast is not for the faint at heart.  I believe the 689 will handle 35 sq ft at 70 mph or more....

--- On Thu, 12/11/08, K4SAV <RadioIR at charter.net> wrote:

From: K4SAV <RadioIR at charter.net>
Subject: Re: [TowerTalk] Spacing between Antennas
To: towertalk at contesting.com
Date: Thursday, December 11, 2008, 9:19 AM

In addition to the tower loading issue (which seems to be suspect), 
consider the torque issue.  Antennas of this size can produce a lot of 
torque on a tower.  That may require some professional help to resolve, 
because you won't be able to get any torque numbers for the tower out of 
US Tower.  I tried to get that data once when I was considering putting 
a MonstIR on a crank-up.   Although the tower, sq-ft wise, was rated to 
handle it, I was afraid of the torque issue.   Take a look at what holds 
a lattice type crank-up together in the torque direction.  It is just a 
few little ears, and those bang against the main legs of the tower when 
torque is applied.

Jerry, K4SAV

John Elsik wrote:

>I just can not help myself.
>We do not even need to start the SteppIR debate.  It will take off in a
direction that will get away from the fundamental issue.
>That is way way too much antenna for that tower!
>At least 42 square feet and over 600 pounds!!  Not counting the rotor.
>On a crankup no less!
>You can not just add up the sq ft numbers when stacking antennas, it does
not work that way!
>You (friend) need to do more research on tower loading.
>Please stop and rethink the whole plan.
>John wa5zup
>  
>

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk