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SSW_Exposure
01-30-04, 09:48 AM
Yesterday I saw a Super Dish mounted on your typical TV tower. It was about 8-10 feet above the roofline, which was probably 15’ above ground. It had a plate that mounted to two of the legs of the tower with the foot bolted in-between.

I mostly do D* installs, but have discussed this very matter with mostly E* installers, who I work with closely, and do some E* work for them.

We also came up with ‘the plate’ idea. With my experience installing Dway dishes I had my reservations about using this ‘plate/tower’ mount more than a few feet above the base, because of ‘wind/ice load’.

I have only mounted Dway dishes on a houses were I could reinforce the wall structure, such as an open garage or a sturdy deck. Most I have mounted on a 10’ pole,3 ½ -4’ underground in cement, with ‘knobs’ welded on to prevent turning. This takes a 2 day install, but being the last part of a Dway install is the PC software, your better of starting that part with, a fresh mind, clean clothes and a shower.

I have joked about a Super Dish twisting a tower into spiral in a heavy wind. But am most concerned about the shaking a 18” or phase III causes when mounted to only one leg, with the mount itself absorbing some of the vibration in a heavy wind.

How many towers will the Super Dish take down ? ?

Would be most interested with other installer’s thoughts and concerns.

oldave
02-05-04, 10:00 AM
I have joked about a Super Dish twisting a tower into spiral in a heavy wind. But am most concerned about the shaking a 18” or phase III causes when mounted to only one leg, with the mount itself absorbing some of the vibration in a heavy wind.

How many towers will the Super Dish take down ? ?

Assuming Rohn 25G or heavier, as well as assuming proper installation of the tower, mounting an 18" or Super Dish on the second section (up to 20 feet above ground) should never be cause for concern.

I've put 3 foot 950MHz parabolas on Rohn 25G at 50 feet and never had an issue. Granted, they weren't solid, so the wind load was less.

Check with Rohn... they'll be happy to help.