Localizers are designed to have a fixed width (something like 700 ft
lateral displacement for full-scale deflection on the CDI) at the
arrival threshold, so longer runways will have narrower angular beam
widths.


Doesn't make sense to me. Angular beam width should be constant - for the far
field. Then the antenna is placed at the distance from the arrival end (also
constant) that gives the proper width.

No?

Jose



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