'Bright
Display' Approach Radar Console | |
This photograph dates from the 1970s after the addition of a basic SSR function. Aircraft without a transponder are shown as a series of simple 'slash' marks (e.g. the returns to the south of Moorabbin). The brightest slash was the aircraft's present position and the fading slashes represented previous positions - the length and direction of the 'trail' indicating the speed and direction of the aircraft's travel. The target symbols shown as circles and squares are IFR aircraft squawking a non-discrete code. Discrete codes were not usable in this system. Note the lack of labels attached to the tracks. The graticle at the outer edge of the screen is a compass rose referenced to magnetic north. (Photo: CAHS collection)
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