PLA Anti-Air Missile (SAM) systems

Stealthflanker said:

Kinda curious if you have sources or reading materials about that. Like say.. other than new missile, does HQ-9C have a new engagement radar ? such as the difference between early HQ-9 and HQ-9B.

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I do not think the HQ-9 designation being upgraded refers to anything other than the missile. I haven't seen any indication that the upgrade to the new AESA engagement radar was not what resulted in the HQ-9 designation being changed to B.