the hull, and when deployed, the sonar is lowered into water several meter below the hull, thus increased detection range by avoiding baffles generated by the hull.11 Anti-submarine armament was limited to short-range rockets and depth charges. Damage control arrangements were minimal. All decommissioned except one reserved as an experiment platform. Type 053H1 (NATO codename Jianghu-II) Improved Type 053H with newer electronics, engine, and replenishment equipment. The sonar for Jianghu-II is SJD-5, which is a Chinese development of Soviet Tamir-11 (MG-11), (NATO reporting name Stag Hoof), with transistors replacing vacuum tubes in the original Soviet MG-11. Armed with six SY-2 in two triple-box launchers. Zhaotong (555) was modified with more advanced systems as a test bed. PL-9C SAMs were added to its 37mm AA gun mounts. 8 remained in service in 2007. Type 053H2 (NATO codename Jianghu-III) Designed on an enlarged Type 053 hull, and displayed European influence. Considered the first "modern" Chinese frigate with airtight cabins, central air condition, NBC protection, and integrated combat system (British CTC-1629/Chinese ZKJ-3A). The sonar for Jianghu-III is EH-5, a development of earlier SJD-5 used on Jianghu-II, with integrated circuits replacing transistors. Armed with two four-box missile launchers, carrying YJ-8 or YJ-82 surface-to-surface missiles (SSM), and four Type 79A 100mm guns in two two-gun turrets. Three were in service with the East Sea Fleet in 1997. Type 053H1Q (NATO codename Jianghu-IV) Modified Type 053H with aft weapons replaced with a helicopter deck for Harbin Z-9 helicopter. Armed with one SY-1 SSM dual-box launcher, and a compact French-made 100mm gun. Only one ship was built; Siping (544) served with the North Sea Fleet. This ship was renamed as Lushun in July 2010, and later transferred to Chinese Naval Academy to serve as a training ship. Type 053H1G (NATO codename Jianghu-V) [[File:053H1G-559.jpg|thumb|Type 053H1G frigate Foshan]] Originally an economy class based on the Type 053H1. Six built by the Guangzhou-based Huangpu Shipyard in the 1990s to meet an urgent need for ships by the South Sea Fleet. Incorporated improvements from the Type 053H2, including air-tight cabins, central air conditioning, NBC protection, and integrated combat system. The sonar for Jianghu-V is EH-5A, the latest variant of SJD-5/EH-5/Echo Type 5 family, and it's a highly digitized version. Initially armed with six obsolescent SY-1A in two tripled-box launchers, later upgraded to eight YJ-83 SSM in two four-box launchers. Type 053H2G (NATO codename Jiangwei-I) Type 053H3 (NATO codename Jiangwei-II) 'Naresuan class'General