What does PJ stand for?

Passive Jamming

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government

Other Resources:

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Samples in periodicals archive:

Passive jamming is another appellation for chaff while active-passive refers to combining aircraft survivability equipment (ASE) jamming with chaff by, for example, reflecting the ASE jamming signal off chaff, thereby misdirecting a jamming antiradiation missile (ARM).

Fundamentals of Electronic Warfare. (Professional Reader)

Its aircraft can be fitted with internal and external EW equipment for threat simulation and active and passive jamming systems covering a wide spectrum of frequencies, and can simulate the specific radar signatures of potential bad guys.

Flight International Inc.: supporting the warfighters

It offers state-of-the-art radar detection against, X, K, Ka (superwide) and instant-on radar guns PLUS the ability to render vehicles electronically invisible to waiting squad cars through a passive jamming technology that is perfectly legal.

Double Protection From Speedtraps; The First Combined Radar Detector ...