Topband: tower vertical

[Bob Kupps]

Hi John

The concrete is not an insulator. Connect a wire to the top and run it down about 2-3 feet out from and parallel to the tower and feed it with an L network against ground radials at the base. You will get RF in your rotor cables if you run them outside the crank up tower so be sure to bypass them with caps to ground at both ends and use common mode chokes on all feed lines.

GL!


________________________________
From: John <john at all-the-facts.com>
To: "topband at contesting.com" <topband at contesting.com>

Sent: Wednesday, September 28, 2011 8:40 AM
Subject: Re: Topband: Topband Digest, Vol 105, Issue 29

I would like some advice of using my crank up US Tower pole as an antenna for 160. The pole is mounted on top of a concrete block that has 4 threaded iron rods on which the pole is set . the block is 5 feet deep. 

Does the concrete block insulate the pole from ground? 

>From each of the 4 rods from the base I have a #8 copper wire to an 8 foot copper clad ground rods. There is also a 30 foot copper tubing that is sunk vertically into the ground.  I start getting water at  about 10 feet. 

So any ideas as of what to in this situation. Best 73 John NS5Z

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