@Shadow:
It is a Radar (Microwave transmission) Dish not a laser. It has an effective azimuth of a X number of degrees it never “focus” any where near 100% of its energy on a single point.
The amount of “radar” energy that reaches the “target” will depend upon the transmission power, the frequency used (atmospheric conditions/scatter/absorption), transmitter design (dish), range to target, size of target (CSA) and others.
The only thing that can be “focused” as apposed to “targeted” is the receiver. And even then the strength of the return signal depends upon the antenna design and needs to be processed.
So if a target is fired upon you are saying that the dish ceases its “scan” sequence and STTs on the target of interest for a short period of time ?? and then continues its scan. We are talking about “soft lock”.
Remember we are talking electro magnetic radiation not a particle gun.
You can’t “FOCUS” a receiver, especially not in the context of this post. A receiver “Receives” RF, there is nothing to focus. The main difference between TWS and RWS operation as applied here is that in TWS the SOFTWARE of the radar system uses an algorithm to guestimate where the track will be based on the speed, heading, altitude, etc… between sweeps. That way when it sees the target on the next sweep, in the same position as what it “Guessed” it would be (Or reasonably close), the software can say with some certainty it is the same the track, even though it didn’t maintain a constant RF stream to the target. STT actively steers the radar array to follow the specific track it is tracking, so there is no reason to guess where it will be. As stated earlier in the post, when you pickle an AIM-120, the radar SHOULD steer the dish to the track and go into STT for a second to verify the track is still there before it passes the information to the missile and goes through the launch sequence, but it’s done by the radar software, so it’s transparent to the operator. Whether or not that’s how it’s actually modeled, beats me.