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" <[email protected]> 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 > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
