Type 79

Became Operational:  August 1938
War Status:  Replaced Type 284 in a few destroyers
Purpose:  Air Warning
Wavelength:  7 meters
Power Output:  70 KW
Range:  60
Remarks:  First British ship-based radar system.  Fitted to HMS Sheffield.
 

Type 271

Became Operational:  First fitted to corvette HMS Orchis in May 1941.
War Status: Used operationally in war on small ships
Purpose:  Surface Warning
Wavelength:  10 cm
Power Output:  5 - 90 KW
Range:  10 - 25
Remarks:  First microwave radar set.  Very successful and fitted to hundreds of ships.
 

Type 272

Became Operational:  1941
War Status: Used operationally in war on destroyers and cruisers
Purpose:  Surface Warning
Wavelength:  10 cm
Power Output:  5 - 90 KW
Range:  10 - 25
 

Type 273

Became Operational:  1941
War Status: Used operationally in war on cruisers and battleships
Purpose:  Surface Warning
Wavelength:  10 cm
Power Output:  5 - 90 KW
Range:  10 - 25
 

Type 274

Became Operational:  1944
War Status:  Replaced Type 284
Purpose:  Main Gunnery Director
Wavelength:  10 cm
Power Output:  400 KW
Range:  16
 

Type 275

Became Operational:  1945
War Status:  Replaced Type 285
Purpose:  AA Fire Control (DP role for Destroyers)
Wavelength:  10 cm
Power Output:  400 KW
Range:  16
 

Type 276

Became Operational:  1944
War Status:  Replaced Type 284 in a few destroyers
Purpose:  Main Gunnery Director
Wavelength:  10 cm
Power Output:  500 KW
Range:  N/A
 

Type 277

Became Operational:  Late 1943
War Status:  The First shipboard set with PPI height-finder.  Not a very good performer
Purpose:  Combined Air and Surface Warning
Wavelength:  10 cm
Power Output:  500 KW
Range:  25 - 35
 

Type 279

Became Operational:  1940
War Status:  Used on large ships.
Purpose:  Type 79 with gunnery ranging
Wavelength:  7.5 meters
Power Output:  70 KW
Range:  100
 

Type 280

Became Operational:  1940
War Status:  Based upon Army GL Mark I set.
Purpose:  Air-warning / AA control
Wavelength:  3.5 meters
Power Output:  25 KW
Range:  N/A
Remarks:  Used for a short time in 1940 - 1941 on old AA cruisers
 

Type 281

Became Operational:  December 1940
War Status:  Most widely used set in WWII
Purpose:  Air-warning
Wavelength:  3.5 meters
Power Output:  350 KW
Range:  120
Remarks:  First used on light cruiser HMS Dido
 

Type 282

Became Operational:  1941
War Status:  Operational
Purpose:  Close range AA control
Wavelength:  50 cm
Power Output:  25 KW
Range:  3.5
Remarks:  First used on HMS Prince of Wales
 

Type 283

Became Operational:  Late 1942
War Status:  Operational
Purpose:  Blind AA Barrage fire for main armament of large ships
Wavelength:  50 cm
Power Output:  25 KW
Range:  8.5
Remarks:  Fitted in almost all cruisers and large ships
 

Type 284

Became Operational:  June 1940
War Status:  Operational
Purpose:  Main gunnery for large ships
Wavelength:  50 cm
Power Output:  25 KW
Range:  10
Remarks:  First fitted to HMS Nelson.  Very successful.
 

Type 285

Became Operational:  Late 1942
War Status:  Operational
Purpose:  Long range AA gunnery
Wavelength:  50 cm
Power Output:  25 KW
Range:  8.5
Remarks:  Variant of Type 284 adapted for small ships.
 

Type 291

Became Operational:  End of 1941
War Status:  Operational
Purpose:  Air warning
Wavelength:  1.5 meters
Power Output:  100 KW
Range:  35
Remarks:  Widely used on small ships throughout WWII