Discussion
What does doubling the diameter of a reflector do to its gain?
Answer: A
Doubling the diameter quadruples the area and so raises the gain by six decibels, while halving the beamwidth in both planes. The three decibel answer would apply to doubling the area rather than the diameter, which is a very common slip. Nothing compensates, and the twelve decibel figure double counts the two planes that are already contained in the area. Being clear whether a change is applied to a linear dimension or to an area prevents most errors of this kind.
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