"HQ-9C" is this thing:
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Not much is known about this system or if it even is called "HQ-9C" but it's some sort of medium/short range air defense system, as for HQ-16FE stats:
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Second picture says HQ-16FE missile has a dual mode radar seeker capable of both semi-active and active homing and has a maximum kill boundary of 160km against fighter aircrafts and also says HQ-16FE is capable of intercepting tactical ballistic missiles and supersonic cruise missiles as well, first picture says the system is capable of tracking 12 targets while engaging 8 of them simultaneously. As the name suggest "HQ-16FE" should probably mean there is a certain HQ-16F system in PLA service. This system seems like an extremely potent medium range air defense considering it could do both anti-missile and anti-aircraft work with considerable range. PL-15 turned into a medium range air defense wouldn't be able to do anti-missile work without significant modification and with the 5.7 conflict, anti-missile work should become a priority for modern air defenses, plus with HQ-16F presumably already in PLA service such a PL-15 air defense system would be unnecessary IMO. It is better to just strap some PL-12s and PL-10s to a Mengshi and call it a day with a dirt-cheap short-range air defense system(Which IMO China isn't lacking in this department either with Type 625 etc.) but could potentially do well in export since it would probably be dirt cheap and helps PLAAF get rid of old PL-12 stock. As for datalink capability, iirc PLA has been working on a triservice datalink system that could be able to link everything together especially with their emphasis on digitized warfare.