(USSR)

Notes: In the late 1950s this HF sonar replaced “Stag Hoof” on the production line. It was essentially the same sonar however it corrected the major deficiency of the earlier system, namely that it could not be adjusted in elevation. This caused a conical “dead zone” directly underneath the ship when conducting a depth charge attack. The transducer on “Stag Ear” is thus able to be manually “tilted” as well as trained. Otherwise it was roughly identical to the earlier system and was often installed as a replacement during refits. It was a searchlight-style sonar and completely manual. The operator had to manually train the transducer and press a button for each individual ping. There was no tracking capability and the system was basically little better than WWII German and American systems. Range is 1NM-2NM depending on conditions.

This was numerically the largest-built postwar sonar, equipping a wide variety of Soviet, Polish, Romanian, North Korean, and East German warship designs and spreading worldwide via export of these types. It was also reverse-engineered by China as the SJD-3, also called Echo Type III. Despite it’s complete obsolescence it remains in use nearly a half-century after it’s introduction.