[TowerTalk] New Tower Install

[h.duck]

I don't think you can have copper directly contacting galvanized metal.  You 
must use s.s. between or an appropriate compound, however, I am not sure 
what that compound should be.

Howard

----- Original Message ----- 
From: "Dan Cisson" <n4gnr at windstream.net>
To: "'Rob Matherly'" <jimrob at gmail.com>; <TowerTalk at contesting.com>
Sent: Monday, April 25, 2016 5:10 PM
Subject: Re: [TowerTalk] New Tower Install


> Rob,,,, first... your base is quite a bit of overkill...For Rohn 25  you
> only need 4 X 4 X 4 at the most...I think 3 X 3 X 3 is plenty.
> Before that amount of concrete can move the tower will buckle.   Rohn 25 
> is
> designed not to go over 30 ft without guy wires.(freestanding)
> And with very little wind load (antenna).  50 ft of unguyed tower is 
> asking
> for a disaster !!!!!
>   A friend of mine in Kentucky, K8MWO, has a 50 ft with a hazer, and a
> KT36XA.
> He has it guyed once I think at 40 ft. He drops the guys with no wind
> blowing, and the hazer comes down and he says maneuvering the guys around
> the hazer travel
> Is the "tricky" part of it. But he has NO PROBLEM with this set up.  He 
> will
> gladly answer any emails to help you with a similar setup
>   As far as grounding,,, ground rods should NEVER go inside concrete.  I
> ground my tower with a 10 ft rod at each leg, with solid copper
> Coming off each leg to the rod. Be sure and ground the guy cables at each
> anchor with at least an 8 ft rod.  You can spend as money on grounding
> As you wish,, but this is a good reasonable setup. I would avoid cadwelds. 
> 2
> clamps per leg, and 2 on the rod,, you will do good. Do NOT use anything
> That will rust up for clamping. If you can get a ground off your electric
> service to the tower grounds,-even better.
>   Your 3 inch pipe WILL get water in it... drill some small drain holes at
> the lowest point. If the pipe is laying in a small bed of gravel,, this 
> will
> Enhance draining,, and not get dirt clogging the holes.
> AND all this is MY OPINION... Good Luck,,, Dan N4GNR
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Rob
> Matherly
> Sent: Monday, April 25, 2016 5:42 PM
> To: TowerTalk at contesting.com
> Subject: [TowerTalk] New Tower Install
>
> Hi All -
>
> First time poster to the list, long-time lurker.
>
> I'm getting set to install my first tower after having been in the hobby
> for nearly 20 years.  I'm going to install 40' of Rohn25 with a Hazer. 
> I'm
> going to set it in a 4x4x5 block of concrete that I have the option to 
> make
> it taller later on (without the Hazer, of course.)
>
> Please advise if I am correct:  I do not need to guy the tower given the
> base size and height, correct?  I've been told I can go up to 50' unguyed
> by some, but others say anything over 40' needs guyed.
>
> Regarding grounding: I've seen different ways of doing it.  What is the
> best way to ground the tower?  Rod at the bottom of the hole?  Rod to the
> side of the slab?
>
> I'm going to feed it underground with a 3" CPVC line coming up into a
> weatherproof box mounted a short distance from the tower.  Do I need to 
> tie
> the ground bus in the cabinet to the ground in the tower, or do I need to
> keep them separate?
>
> Thanks
>
> Rob
> w0jrm
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