Type 22 radar

Type 22 radar
Name	Type 22 radar
Country	United Kingdom
Introduced	1942
Frequency	S-band
Range	surface search ~25 nmi, air search ~100 nmi
Platform	destroyers, cruisers

Type 22 radar was a British naval surface-search and fire-control radar introduced during World War II and deployed extensively on Royal Navy destroyers and cruisers. It provided combined surface-search, target-indication and limited gunnery support, entering service amid the Battle of the Atlantic, Operation Torch, and the broader naval campaigns against the Kriegsmarine and Regia Marina. The set influenced postwar radar development in the Royal Navy and allied navies, seeing action in the Mediterranean theatre, the Arctic convoys, and the Pacific War.

Development and Design

Type 22 originated from wartime efforts led by the Admiralty Research Establishment and the Telecommunications Research Establishment to improve detection of small surface craft, submarines on the surface, and low-flying aircraft. Engineers drew on earlier work exemplified by Type 271 radar and lessons from experiments aboard HMS Rodney and HMS Ajax. The design combined innovations from teams that had collaborated with firms such as Marconi Company and British Thomson-Houston, influenced by discussions at Woolwich Arsenal and testing at Portsmouth Naval Dockyard. Operational requirements set by the Admiralty emphasized a compact, shipboard-installable set for destroyer flotillas operating with carriers like HMS Illustrious and battleships such as HMS King George V.

The antenna and scanner assembly used in Type 22 reflected advances pioneered by developers who earlier worked on Chain Home derivatives and mobile radar used in the Battle of Britain. Designers balanced beamwidth and rotation rate to support surface-search resolution and short-range fire-control cueing alongside electronic countermeasure considerations observed in encounters with the Luftwaffe and the Imperial Japanese Navy.

Technical Specifications

Type 22 operated in the S-band microwave range with a pulse-modulated transmitter enabling detection ranges suitable for destroyer operations. Key parameters included pulse repetition frequencies and pulse widths optimized for discriminating small contacts such as torpedo boats and surfaced submarines encountered during convoys escorted by ships like HMS Cossack and HMS Tartar. Antenna arrays provided a narrow horizontal beam for bearing accuracy and a moderate vertical pattern to handle low-angle sea returns; signal processing relied on cathode-ray tube displays integrated with gyro-stabilized mounts similar to those fitted on HMS Hood and HMS Belfast.

The set supported range accuracy adequate for director systems aboard flotilla leaders and cruisers including HMS Sheffield and HMS Belfast, enabling integration with fire-control directors influenced by inventions from Arthur E. Kennelly-era engineering teams and practices employed at Portsmouth Dockyard. Power requirements and maintenance schedules matched destroyer engineering routines developed for classes such as Tribal and Town ships.

Variants and Modifications

Several wartime and postwar variants adapted the basic Type 22 architecture for mounting constraints and evolving missions. Modifications paralleled developments seen in sets like Type 271 and Type 279, with experimental versions trialled on vessels including HMS Cygnet and HMS Campbeltown. Later modifications addressed electronic countermeasures revealed during encounters with German radar detectors and Japanese jamming tactics, while postwar upgrades incorporated valve and later transistor improvements akin to those used in Type 965 radar evolutions.

Some variants were fitted with improved stabilization and higher-power transmitters for extended air-search overlap, a trend also observable in postwar conversions for ships transferred to allied navies such as the Royal Australian Navy and the Royal Canadian Navy.

Operational Service

Type 22-equipped ships served across multiple theatres, supporting convoy escort duties in the North Atlantic, interdiction missions in the Mediterranean Sea, and fleet actions during the Pacific War. Destroyer squadrons employing the set coordinated with carriers like HMS Furious and battleships such as HMS Prince of Wales during escort and screening operations. Crews trained at facilities including HMS Collingwood and operated the sets alongside Signals Branch personnel drawn from establishments like RN Signal School.

The radar contributed to tactical situational awareness during engagements such as escort actions protecting convoys to Murmansk and during amphibious operations like Operation Husky. Interoperability with British fire-control systems and liaison with allied platforms from the United States Navy and Royal Australian Navy enhanced combined task force effectiveness.

Combat Performance and Losses

In action, Type 22 proved valuable for night surface detection and short-range targeting but had limitations against high-altitude aircraft and in severe sea clutter conditions experienced in the Arctic convoys. Enemy countermeasures employed by the Kriegsmarine and Luftwaffe sometimes degraded performance, leading to tactical adjustments by commanders such as those who served on HMS Bedouin and HMS Eskimo. Losses of Type 22-equipped vessels resulted from combined threats—submarine torpedo attacks by units of the U-boat arm and air strikes during carriers' operations—illustrated by sinkings of destroyers and cruisers throughout the war.

Post-battle analyses by the Admiralty and reports from flag officers influenced subsequent doctrine and retrofits, paralleling lessons captured in after-action reviews from operations involving ships like HMS Exeter and HMS Penelope.

Surviving Examples and Preservation

A small number of hulls or components from Type 22-equipped vessels survive in museums and heritage collections associated with institutions such as the National Maritime Museum (United Kingdom) and the Imperial War Museum. Displays that reference wartime radar technology include exhibits at Science Museum, London and preserved warships like HMS Belfast where similar radar equipment and contextual documentation are presented for visitors. Restoration and interpretation projects are supported by volunteers from societies connected to former ship classes, maritime trusts, and naval history organizations including the Royal Naval Association.

Category:Naval radars of the United Kingdom