Well, that last clue pretty much handed it to me on a plate. So, since I don't really deserve any credit for getting it, here's an easy one. (Not that today's clues will give it away, but it will get easy pretty fast.)
Looking for a piece of equipment carried on a number of combat aircraft.
1. It was somewhat low tech, at least conceptually. More like Miss Tilly's diaphragm than the cavity magnetron.
2. Two distinct varieties were produced.