A low impedance tower ground is important. Google TOWER FOOTING RESISTANCE
for an IEEE ppt. on this. I would aim for a couple of ohms. That means
several long rods.
Dave WX7G
On Jul 27, 2012 9:06 AM, "HAROLD SMITH JR" <w0rihps@sbcglobal.net> wrote:
> About 20 years ago I decided to do something about lightning protection.
> My tower is 80 feet of Rohn 45G, with a 5el Telrex monoband 20 meter yagi
> at 82
> feet.
>
> Hygain 153BAS at 90 feet and Hygain 103BAS at 100 feet. I have a homemade
> antenna
>
> switch box near the top.
> I shunt feed the tower with an Omega Match for 160. The shunt rod is
> 1/2inch EMT
> conduit.
>
> I use vacuum variables in the Omega match.
> At 65 feet I have a Diamond X200 for 2meter/440mhz. all cables come to the
> base
> and go underground
>
> to a steel box at the entry to the house. The HF antennas are fed with
> RG-17 and
> go through an ICE
>
> 308 15kw coax arrestor. The X200 is fed with RG213 through a PolyPhaser
> arrestor. The control wires
>
> all go through PolyPhaser arrestors. I made LC to UHF adapters.
> My tower is the tallest thing for several miles. The tower is guyed with
> 6700lb
> Phillystrand.
> So far so good.
>
> Price W0RI near St. Louis, MO
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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