Look, there is a simple first-principles approach to choosing airplane types for airborne radar systems. I will lay it out here for discussion purposes.

Think in terms of power. If you google the radar range equation, you will notice that the maximum range for a radar is determined by the 4th root of the power supplied to it. On a ground system, you can pump in as much power as needed, and so you are primarily constrained by the terrain (eg. mountain ranges, curvature of the earth etc.). On an airborne system, that power has to come from the airplane. Now, either you carry an onboard source of power, or you hook up generators to the airplane engines to divert electrical power to the radar.

But the airplane also needs power from the engines to fly. So you cannot divert all the engine power to the radar. This brings in the power-to-weight ratio of the airplane. The higher the power-to-weight ratio, the more juice you can extract for your radar system.

Now, as a mathematical exercise, let's use the E-3D AWACS as a reference point. We know from its public data that the electrical generator attached to each of the 4 engines generates 1 MW of power for the radar. So a total of 4 MW for the radar system. Going back to the radar equations, let's also assume that for comparison purposes, all of our airplanes will have the same radar capability (Gains, frequency, target RCS etc.). In other words, we are assuming a world where all of the different AEW/AWACS designs have the same radar technology (which obviously is not true). So this is a conservative comparison.

If you then compute the percentage of the power available that is used in the E-3D for its radar as a function of its overall available power and weight, then with the above assumptions, you can plot for all airplanes the maximum range of the radar that they will have (as shown here):

Notice how quickly the turbofan/turbojet engine airplanes separate themselves into a different bubble from the propeller airplanes. Both in terms of radar ranges as well as power-to-weight ratios.

Some noticeable items from the above plot:

1. The Chinese ZDK-03 is the most powerful propeller-powered airplane with a radar on top (not counting some C-130 mods in the USA). But we know its radar range is much smaller than what the plot above shows. This is because we are assuming the E-3D radar tech is inside the ZDK-03. Obviously that isn't true, and the Chinese radar tech is poorer quality, so despite the potential of the airplane, its actual capability is lower.

2. Do-228 is not an option as I have mentioned in my previous post. You can see that clearly here.

3. C-295 will barely make the grade as well.

4. Notice that the Phalcon has a lot of power to play with, but because of its poor endurance and unsuited airframe, loses out.

5. Notice where the A-330 AWACS(I) would fall on that plot! As I said before, this project needs to be advanced on high priority. The closest in terms of capability to it would be the E-3D and the E-767 (Japan).