(USSR)

Notes: This active/passive sonar was carried aboard the “Romeo”, “Foxtrot”, “India” and (most likely) the Chinese “Ming” classes of submarines. It was a searchlight-style system with a single large transducer, carried in the keel of the submarine, behind a free-flood acoustic “window“. It had a crude analog computer (the “Leningrad” system) capable of auto-tracking two targets and generating a fire-control solution on one. The Leningrad computer calculates in two dimensions and it was typical to fire a two-torpedo spread to compensate for a possible miscalculation in range.

On the “Foxtrot: class, there were also several small hydrophones located in the sail associated with this system.

“Pike Jaw” was limited by the fact that it could only be operated for 8 hours before it needed a several-hour rest cycle for the components. Mean time between failure was estimated at 1200 hours. The transducer could not calculate depth and therefore it’s ASW potential was limited.

The system is obsolete and has been completely exploited by USN intelligence, in fact, it has now been sold on the open market and can be freely examined by civilians.