OVERVIEW: The Kelvin Hughes Mk.IV radar is a naval navigation and surface search radar introduced during the late 1940s, commonly installed on British and Commonwealth warships. It reflects early Cold War maritime radar technology focused on simplicity and reliability for safe navigation and surface contact awareness.

GENERAL DESCRIPTION: The KH Mk.IV operates in the I-Band (X-Band) and was developed as a practical upgrade to wartime radar sets. Utilizing magnetron-based transmission and CRT-based PPI displays, it provided continuous 360° scanning for navigational and surface surveillance purposes. Its antenna design and stabilized platform enabled reliable performance in various sea states. Though analog and limited in resolution, it significantly enhanced safe passage in poor visibility.

ROLE SUMMARY:
Category: Navigation and Surface Search Radar
Primary Use: Shipborne navigation and surface contact detection
Function: Surface situational awareness, collision avoidance
Platform: Frigates, destroyers, auxiliaries (primarily UK/Commonwealth)

See Specific information under [Sensors/EW] and [Properties] sections.

SOURCE:
Naval Institute Proceedings (1940s–1960s)
Kelvin Hughes historical technical brochures