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#19
May 28th 04, 02:24 AM
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In article
ogers.com, David Megginson wrote: Teacherjh wrote: The longer runways are more likely to have critical areas. Why? The localizer will be closer to the (opposite) runway threshold. All the best, David Why should runway length affect how far the localizer antenna is from the runway end? 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. But (to the best of my knowledge) this is done by adjusting the spacing of the transmitting elements on the localizer array, not by adjusting the distance of the array from the runway end. 
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