Can we glean anything from the fact that it employs a RF seeker in lieu of IIR tech?
Is radar more suitable for HTK applications than IIR hence it's use in the HTK PAC-3?
A radar seeker allows for an SARH guidance mode as well, along the lines of that used by ESSM, ie: the powerful radar in the launch / off-board aircraft or perhaps even a separate platform type (through data-linking) provides guidance rather than the tiny radar in the missile.
Such is not possible with an IIR seeker...
This capability is present in AMRAAM today which makes a mockery of the fools of the type on ELP's blog who call for "multi-mode seeker" technology missiles, implying in the process that we don't have them today...
What active radar, SARH, radar homing and GPS aided IMU guidance all in the same missile (in the case of AIM-120D), isn't enough for you?
And then something like NCADE rolls out, which has all of that AND an IIR seeker and of course it's STILL not good enough...