[Fenbeiduo]

I believe a "passice " system means that it can only detect radar waves. An "active system" transmits and recieves radar waves. The tail warning radar in WWII fighters was an active system but there was no CRT display,just the bell and the light. Were it a passive system,it would only tell the pilot that it has detected a radar transmission from the enemy AC. And active radar in WWII was used only on night fighters and some bombers for navigation and target aquisition purposes.

I know what U mean---i think.
I don't know the definition of active/passive radar.but I believe it works just like a bat : transmits sond waves-----> Meets the barrier----->recieves sond waves.
from the other hand ,I can't agree that "AN/ASP-13"is a active radar .because Mustang use it ---but Mustang never been used as a night fighter.