The SVA (Single Vertical Phased Array) can equal or exceed the performance of a
4Square Array using only a single 39 foot aluminum mast. The front and back
(top) guy wires, supporting the vertical, are driven with the correct amplitude
and phase to produce a 3 element Endfire array having more gain than a 4Square
array. Only a single highpass network is required to drive the front element
(no quadrature network) since the center element is parasitic and the back
element is driven at zero degrees. As with a 4Square the front and back phases
and amplitudes are reversed to reverse the pattern direction. With 4 top guys,
patterns are produed in 4 directions
just like a 4Square.
With a lightweigh 39 foot vertical, hinged at the ground, a single person can
raise or lower the array. The SVA has a very small wind load and is guyed with
"String Trimmer Line" to wood posts
placed in the proper locations. The SVA technique has application for 160
meters using broadbanded short elements. The full design of the SVA appears on
my website www.WA2WVL.com.
Floyd WA2WVL
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