Hi-Z Antennas Hi-Z 8A-160 Посібник - Сторінка 4

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Constructing Elements for The Array

There are likely as many ways to construct elements for an 8-Circle array, as there are people in the world.

What the array needs is 8 insulated vertical elements that are as near identical as possible. Each vertical

needs a companion ground rod. For array operation at 160 meters and below the elements should be 15 to

20 feet in length. The 20-foot length has been established to be optimum for best signal output level

combined with voltage and phasing accuracy. The penalty in performance when dropping to 15-foot length

is indeed real but difficult to measure and there are successful systems using this length. If one were not

concerned with 160-meters but only higher bands such as twice the frequency at 80 meters and 100 foot

diameter, then a 10-foot element would be fine. There is one 160-meter system presently operating with just

6-foot elements and lowest band performance is marginal at best. It also required measuring and adjusting

element voltages and phases very accurately. If you want the best performance, stick with 15 to 24 foot

length elements with 20-24foot length being the best.

The diameter of the element has very little effect on the array. Some have used metal tubing while others

have used fiberglass fishing rods with small wire strung through the hollow center. A mounting arrangement

that utilizes large conducting surfaces close to the element will decrease the signal output of the element.

Even wet wood posts should be kept a minimum of 4 inches away from the elements. Plastic or ceramic

insulators are the best choice. PVC pipe works well. Each element will require a ground rod driven into at

Hi-Z 8A Element Man. 3.0