You might check here:
http://archive.hnsa.org/doc/radar/index.htm for information.
I found this reference in a quick search:
Quote:
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If provisions are not available for operation of IFF with SJ-a or SJ-1 radar, all questionable targets should be challenged by means of the SD radar's IFF system.
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To my knowledge, there is no such capability in SH4, modded or not. (Unless radar contacts in the unmodded game show up in blue/red colors. But I believe they are shown as grey until they reach visual range.)