Don Havlicek wrote:
>The 'right triangle' system utilizes two verticals per selected
>direction with the third 'floating'. The 'equilateral triangle' system
>uses all three verticals simultaneously,
Any triangle system can be used with either two or three elements
energized  check with ON4UN's book for details. In either case, the
most practical and versatile system for beam switching is the
equilateral triangle.
When only two elements at a time are used (the third being
disconnected), an equilateral triangle gives three directions along the
sides. With three identical elements and groundplanes, you have easy
reversal for a total of six directions.
When all three elements are used, usually one is driven with 100%
current, and the other two are driven at the same phase with about 50%
current each. The beam directions are off the top or the bottom of the
triangle (so they are moved around 60deg compared with the twoelement
case). The gain is higher using all three elements, but beam switching
is much less simple so you may be practically restricted to only three
directions.
Any rightangled triangle would be less versatile than either of these
equilateral cases.

73 from Ian GM3SEK
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