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CHAPTER
Grounding the antenna: What is a good ground
THE SUCCESS OR FAILURE OF A RADIO ANTENNA SYSTEM OFTEN (PERHAPS USUALLY)
hangs on whether or not it has a good RF ground Poor grounds cause most antennas to operate at less than best efficiency In fact, it is possible to burn up between 50 and 90 percent of your RF power heating the ground losses under the antenna, instead of propagating into the air Ground resistances can vary from very low values of 5 , up to more than 100 (5 to 30 is a frequently quoted range) RF power is dissipated in the ground resistance The factors that affect the ground resistance include the conductivity of the ground, its composition, and the water content The ideal ground depth is rarely right on the surface, and depending on local water table level might be a couple meters or so below the surface It is common practice among some amateur radio operators to use the building electrical ground wiring for the RF antenna ground of their station Neglecting to install an outdoor ground that will properly do the job, they opt instead for a single connection to the grounded third wire in a nearby electrical outlet Besides being dangerous to work with, unless you know what you are doing, this is also a very poor RF ground It is too long for even the low RF bands, and radiates RF around the house in large quantity Stations that use the household electrical wiring as the radio ground tend to cause TV interference, broadcast interference, and other electromagnetic interference both in their own building and in nearby buildings Fortunately, there are some fixes that will help your situation We can reduce the ground resistance by either altering the composition of the earth surrounding the ground point, or by using a large surface area conductor as the ground point Figure 29-1 shows the traditional ground rod used on small radio stations, including amateur stations Use either a copper (or copper-clad steel) rod at least 6 ft long (8 ft preferred) Electrical supply houses, as well as amateur radio and communications equipment suppliers, also sell these ground rods Do not use the nonclad
Copyright 2001 - the McGraw-Hill Companies
574 Grounding the antenna: What is a good ground
To transmitter Ground
8-foot copper or copper-clad steel rod
29-1 Single ground rod works almost
steel types sold by some electrical supply houses They are usable by electricians when making a service entrance ground on your home or workplace, but RF applications require the low skin resistance of the copper-clad variety The rod need not be all copper, because of skin effect forcing the RF current to flow only on the outer surface of the rod Try to use an 8-ft rod if at all possible, because it will work better than the shorter kind Do not bother with the small TV-antenna 4-ft ground rods; they are next to useless for HF radio stations Drive the ground rod into the earth until only 6 in or so remains above the surface Connect a ground wire from your station to the ground rod The ground wire should be as short as possible Furthermore, it should be a lowinductance conductor Use either heavy braid (or the outer conductor stripped from RG-8 or RG-11 coaxial cable) or sheet copper You can buy rolls of sheet copper from metal distributors in widths from 4 in up to about 18 in Some amateurs prefer to use 7-in-wide foil that is rated at a weight of 1 lb/linear ft Sweat-solder the ground wire to the rod You can get away with using mechanical connections like the electricians use, but you will eventually have to service the installation when corrosion takes its toll I prefer to use soldered connections, and then cover the joint with either petroleum jelly or acrylic spray lacquer Another alternative is to use a copper plumbing pipe as the ground rod The pipe can be purchased in 8-ft through 16-ft lengths from plumbing supply shops or hardware stores The pipe selected should be 3 4 in or larger Some people report using up to 2-in pipe for this application The surface area of the hollow pipe is greater than that of a solid rod of the same diameter Because of certain current flow geometries in the system, however, the ground resistance is not half the resistance of a rod of the same diameter, but is nonetheless lower Driving a long pipe into the ground is not easily done Unlike the copper-clad steel rod, the pipe has no compression strength and will deform when you hit it with a hammer or other driving tool To overcome this problem (see Fig 29-2) you can use a garden hose as a water drill Sweat solder a tee joint on the top end of the pipe, and then sweat-solder a faucet fitting that matches the garden hose end on one end of the tee joint Cap off the other port of the tee joint Use the tee
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