The Emerson Electric AN/APQ-159 was an I band/J band radar designed to upgrade Emerson's simple AN/APQ-153 used in the Northrop F-5. It offered roughly
Many of the F-5s still flying have been upgraded to the improved AN/APQ-159. The APQ-153 was a relatively simple Pulse-Doppler radar intended to improve
about 10 nautical miles (19 km; 12 mi). A further upgrade produced the AN/APQ-159, which offered longer range of about 20 nautical miles (37 km; 23 mi)
F-5 AN/APQ-158 for the MH-53 Pave Low helicopter AN/APQ-159 improved AN/APQ-153 fire control radar by Emerson Electric Company for Northrop F-5 AN/APQ-160