List of World War II British naval radar
This page is a List of World War II British naval radar.
Nomenclature
These sets were initially numbered as wireless telegraph sets, but a distinguishing prefix of "2" was soon added. Metric sets were numbered in the 28x and 29x series. When centimetric sets arrived with the advent of the cavity magnetron, they were numbered by subtracting 10 from the metric type number they were based on. This was not always possible however, as Types 271 - 274 were already in use for original centimetric sets, thus some metric sets in the Type 28x range had 20 subtracted. Aerial outfits were given a three letter identifier that began with "A".Suffixing letters indicated the following;
- B - conversion of sets with separate transmitting and receiving antennas to single antenna operation.
- M, P, Q - major set modifications
- R - addition of range-taking panel
- U - modification to suit coastal operations
- W - modification to submarine use
- X, Y, Z - experimental modifications
Sets
ASV II
The first successful Air to Surface Vessel radar, from early 1940. ASV II was a re-packaged ASV I but otherwise similar. ASV II radar allowed RN Swordfish from the carriers and to locate and attack the German battleship in May 1941.ASV III
The first successful airborne microwave radar. Used on Navy Swordfish and Barracuda aircraft, and many RAF Coastal Command aircraft. High-resolution centimetric radar could detect even small objects, such as the periscope or snorkel of a submerged submarine, making it a highly efficient tool for ASW. The Mk XI was a further development exclusively for the Fleet Air Arm.Type 79">Type 79 radar">Type 79
Based on the Type 79 w/t, first fitted to then and later ;Type 86
Fore-runner to Type 286.Type 262
Centimetric fire-control set for 40 mm Bofors weapons. Fitted to Close Range Blind Fire director and STAAG weapon mount. Dish antenna spun off-centre at high speed to produce scanning cone, target lock and blind fire possible.Type 267
Air warning set for submarines replacing Type 291W.Type 268
First X band naval radar. Used on small vessels for target indication and navigation.Type 271">Type 271 radar">Type 271
| Type | Aerial outfit | Peak power | Frequency | Wavelength | In service |
| 271 | 5 | 2,997 | 100 | March 1941 | |
| 271P | 90 | 2,997 | 100 | 1943 | |
| 271Q | 90 | 2,997 | 100 | 1943 |
Type 271 was the original naval centimetric target indication radar, later fitted with a plan position indicator. Type 271 had separate transmit and receive aerials, small "cheese" antennas stacked on top of each other. The antenna array was carried in a distinctive protective perspex "lantern", and initially had to be fitted directly onto the radar office roof due to limitations in coaxial cabling. The Type 271 was a vitally important war weapon, as for the first time it allowed escort ships to reliably detect surfaced U-boats or even just their periscopes. It was first fitted in. 350 sets were ordered. Modification Q was much more powerful and known as the "Centimetric Mark IV". Mark V was even more powerful and later renamed Type 277. Type 271 was fitted widely to escort vessels of corvette and frigate size, with the unsuccessful Type 272 intended for destroyers and the Type 273 for cruisers and battleships.
Type 272
A version of the Type 271 with a cable-drive and more powerful receiver allowing the antenna to be mounted remotely from the radar office. Was not considered successful and not widely used.Type 273
| Type | Aerial outfit | Peak power | Frequency | Wavelength | In service |
| 273 | AQN | 90 | 2,997 | 100 | 1941 |
A version of the 271 with a much larger diameter full-parabolic antennas instead of the smaller clipped "cheese" antennas of the 271. The antennas were mounted on a stabilized mounting and placed high on the mast on cruiser and battleship sized ships. The larger antennas more than made up for the wiring losses seen in the 272, and the resulting system was even more powerful than the original 271. Upgrades followed those of the original 271 series. In the Battle of the North Cape, identified the target of at using her Type 273 set, receiving a solid signal on the Scharnhorst's mast while the ship was still well below the radar horizon. Replaced by the Type 276.
Type 274
| Type | Aerial outfit | Peak power | Frequency | Wavelength | In service |
| 274 | AUM | 500 | 3,294 | 91 | 1944 |
Centimetric replacement for Type 284. Main armament ranging and shot-spotting set for cruisers and battleships. "Double cheese" antennas. Most notably in place on HMS Belfast
Type 275
Centimetric replacement for Type 285. Destroyer main armament and capital ship secondary fire control set. Fitted to directors HACS Mark VI and Mark 6M and modified American Mark 37. Separate Tx and Rx dishes.Type 276
Combined the electronics of the Type 277 and the stabilized mounting of the Type 273. Reduced antennas in aerial outfit AUS.Type 277">Type 277 radar">Type 277
| Type | Aerial outfit | Peak power | Frequency | Wavelength | In service |
| 277P | AUK | 400 | 2,997 | 100 | 1943 |
| 277Q | ANU | 500 | 2,997 | 100 | 1944 |
Originally known as Type 271 Mark V, this was a significant upgrade of the original design and was later renamed to make this clear. Used a single transmit/receive antenna, waveguides instead of coaxial cables, and a much more powerful magnetron that significantly improved all-around performance. Aerial Outfit AUK was a parabolic dish, ANU was a cropped paraboloid. Fitted on a "nodding" mount, often used as a height finding set. Superseded in service by Type 278 height finder in s.
Type 279">Type 279 radar">Type 279
Follow on from Type 79, metric air warning set. Had separate Tx and Rx antennas, combined in Type 279M to single antenna operation. This set also had a secondary surface search with surface and aerial gunnery capability and used a Precision Ranging Panel, which passed accurate radar ranges directly to the HACS table.Type 280
Metric air warning set with separate Tx / Rx antennas. Based upon Army GL Mark I set, fitted to s converted to anti-aircraft ships. This set used a Precision Ranging Panel, which passed accurate radar ranges directly to the HACS table.281 radar|Type 281]]
| Type | Aerial outfit | Peak power | Frequency | Wavelength | In service |
| 281 | AQB | 350 | 85 | 3,500 | 1940 |
Metric air warning set with separate Tx / Rx antennas. Type 281B had combined Tx / Rx antenna. First fitted to then This set also had a secondary surface search function along with aerial and surface gunnery capability and used a Precision Ranging Panel. The Type 281 ranging system allowed the user to select either a 2000yd to 14000yd or a 2000yd to 25000yd range display with range accuracies of 50 or 75yds RMS, respectively. Aerial target ranges were passed directly to the HACS table.
Type 282
Decimetric ranging set for Bofors 40 mm and "multiple pom-pom" fire control. Fitted on Bofors mounting Mark IV "Hazemeyer" and "Pom-pom Director Mk IV", twin Yagi antennas. Type 282 used a mechanical ranging panel and a 0-5000yd display. Type 282M increased transmission power to 150 kW, used a 0 - 6000yd display and introduced Beam Switching, while Type 282P introduced a Precision Ranging Panel.Type 283
Main armament anti-aircraft barrage fire control set fitted to "barrage director" for cruiser and battleship guns. This set used a Precision Ranging Panel and was used to fire the guns automatically using the Automatic Barrage Unit.Type 284
Main armament ranging and shot-spotting set for cruisers and battleships with lobe switching beginning with Type 284M to increase accuracy of bearing readings. Prototype fitted on. received first production set. Used by to shadow. Type 284P was instrumental in the Battle of the North Cape, effectively allowing to sink blind.Type 285">Type 285 radar">Type 285
Ranging set for anti-aircraft fire control, fitted to HACS directors and rangefinder-directors and used ranging panel L12. Type 285 with six element Yagi antenna with separate Tx / Rx. Type 285P with five element Yagi antenna with combined Tx / Rx function. The Type 285M could provide accurate ranges via the mechanical ranging panel, L12, and bearing information using lobe switching, but height finding was primitive and had to be calculated using maximum signal indication. As such it could not achieve a target lock, and could not offer blind fire capability. Type 285P introduced a Precision Ranging Panel and had 25yd RMS range accuracy.Type 286
Metric target indication set based upon RAF ASV Mark II set. Type 286M had fixed antennas, with a central Tx and an Rx on either side to give some indication of contact bearing. The antennas were fixed, scanning being achieved by conning the ship. Type 286PU and Type 286W were fixed antennas sets for coastal vessels and submarines respectively. Type 286PQ had a steerable combined Tx / Rx antenna from the Type 291 set.Type 290
Metric target indication set, replacement for Type 286.Type 291">Type 291 radar">Type 291
| Type | Aerial outfit | Peak power | Frequency | Wavelength | In service |
| 291 | 100 | 214 | 1,400 | 1941 |
Metric air warning sets. Original Type 291 had a hand-steered antenna, replaced by Type 291M with power training and plan position indicator. U and W variants for coastal craft and submarines respectively.
Type 293">Type 293 radar">Type 293
| Type | Aerial outfit | Peak power | Frequency | Wavelength | In service |
| 293M | AUR | 500 | 2,997 | 100 | 1945 |
| 293P | AQR | 500 | 2,997 | 100 | 1945 |
| 293Q | ANS | 500 | 2,997 | 100 | 1945 |
Based on the same electronics as the Type 277/276, the Type 293 used a new antenna design intended to cover the area above the ship to provide air warning instead of surface search. Stabilised "cheese" antenna, diameter in outfit AUR, upgraded to in Type 293P and to in Type 293Q.