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Originally Posted by elanaiba
Actually, that's the SJ - Surface search radar. The SJ first appeared with an A-scope type display and later - through the SJ-a/SJ-1 version, gained the PPI type screen.
The SD - aircraft search radar - also had an A-scope, and was non-directional. We don't model that one as mannable station.
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Ah, okay. In the case of the SD radar, how do we know, then, when an aircraft contact has been picked up by the device?