|[AMRadio] Tower Construction|
garyschafer at comcast.net
Mon Jun 12 22:10:00 EDT 2006
Be careful when giving this advice.
A UFER ground is a good SUPLEMENTAL ground in a tower base but it should not
be the only ground. A large area like a floor of a building provides more
surface for the lightning to dissipate. A tower concrete foundation may not
be large enough by itself and there is the possibility of poor connections
inside so that the concrete crack from a lightning strike if it is the only
ground connection. It is always recommended that ground rods be attached to
each tower leg in addition.
> DO RUN THE GROUND THROUGH THE CONCRETE! Take a look at the information on
> this site first though. You may be glad you did.
> Best Regards,
> Steve White, W5SAW
> SW Commercial Electronics
> -----Original Message-----
> From: Ed Swynar [mailto:gswynar at durham.net]
> Sent: Saturday, June 10, 2006 2:16 PM
> To: Discussion of AM Radio; boatanchors at mailman.qth.net
> Subject: Re: [AMRadio] Tower Construction
> Hi Dave,
> I have a 48' tall, tapered, self-supporting "Delhi"-brand tower --- 6
> sections at 8' long each.
> The prescribed / manufacturer's recommendation is to bolt a 3' straight
> formed extention at the base of each leg (total of 3), & to "suspend"
> (a temporary wooden "cradle" will do admirably, as the cement sets) in a
> hole dug 4' square, & 4-1/2' deep --- the cement is to come but a few
> below the bottom legs of the actual tower section.
> Oh yes --- the bottom 1' of the square hole is to be "belled" outward a
> foot, or so.
> The documentation says this is good for heights of up to 64', or so...I've
> never gone beyond 48', & have never, EVER had an ounce of trouble in the
> locations that I've had my tower up.
> BTW, the top of the tower as an old Cornell-Dubelier AR-44 rotator, & a
> 3-element Hy-Gain TH3 MkIII triband yagi...
> Use "industrial"-grade coarse cement, & do NOT run any ground leads
> the block itself!
> ~73~ Eddy VE3CUI - VE3XZ
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