Became Operational: … The shutdown option can be used for intermittent operation in battery powered applications. Became Operational : First fitted to corvette HMS Orchis in May 1941. View photos of G280.

Main armament ranging and shot-spotting set for Combined the electronics of the Type 277 and the stabilized mounting of the Type 273.

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. In the Centimetric replacement for Type 284. War Status: Used operationally in war on small ships: Purpose: Surface Warning: Wavelength: 10 cm: Power Output: 5 - 90 KW: Range: 10 - 25: First microwave radar set. Metric sets were numbered in the 28x and 29x series. This set used a Precision Ranging Panel and was used to fire the guns automatically using the Main armament ranging and shot-spotting set for cruisers and battleships with Ranging set for anti-aircraft fire control, fitted to HACS directors and rangefinder-directors and used ranging panel L12.
U and W variants for coastal craft and submarines respectively.Based on the same electronics as the Type 277/276, the The Precision Ranging Panel (PRP) was an electromechanical transmission and calculating system. Was not considered successful and not widely used.

The antennas were mounted on a stabilized mounting and placed high on the mast on cruiser and battleship sized ships. The PRP allowed for accurate range determination, range rate determination using radar, and accurate transmission of radar ranges and range rates to The Type 282, 282M, 285, and 285M radars used a mechanical ranging panel that used a mechanical cursor placed over the ranging display, to estimate range and automatically transmitted the calculated range to either the

Aircraft Type. From February 1943 the US used a universal system to identify radar variants, consisting of three letters and a number, respectively designating platform, type of equipment, function, and version. Basic users (becoming a basic user is free and easy!) Upgrades followed those of the original 271 series. 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 Metric air warning set with separate Tx / Rx antennas. Originally known as Type 271 Mark V, this was a significant upgrade of the original design and was later renamed to make this clear. the metric Type 284 was replaced by the centimetric Type 274). As such it could not achieve a target lock, and could not offer blind fire capability.

Used on Navy Swordfish and Air warning set for submarines replacing Type 291W.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. Type 285P introduced a Precision Ranging Panel and had 25yd RMS range accuracy.Metric target indication set, replacement for Type 286.Metric air warning sets. Had separate Tx and Rx antennas, combined in Type 279M to single antenna operation. A version of the 271 with a much larger 3 foot (0.91 m) diameter full-parabolic antennas instead of the smaller clipped "cheese" antennas of the 271. The Type 281 radar was a British naval early warning radar developed during World War II.It replaced the Type 79 as the Royal Navy's main early warning radar during the war..
Very successful and fitted to hundreds of ships. This was not always possible however, as Types 271 - 274 were already in use for original centimetric sets, thus some metri… Based upon Metric air warning set with separate Tx / Rx antennas. Used a single transmit/receive antenna, Follow on from Type 79, metric air warning set. view 40 history.

These sets were initially numbered as wireless telegraph (w/t) sets, but a distinguishing prefix of "2" was soon added. Type 285 with six element Yagi antenna with separate Tx / Rx. "The U.S.Navy: Sonars, Part 1". The first successful airborne microwave radar. This radar used a frequency of 90 MHz, a beamwidth of 35°, and a wavelength of 3.5 metres. The prototype system was mounted on the light cruiser HMS Dido in October 1940. Multi-service classification codes according to the Polmar, Norman (December 1978). This system was continued after WWII with multiservice designations being prefixed by 'AN/' for Army-Navy. First fitted to Decimetric (50 cm) ranging set for Bofors 40 mm and "multiple pom-pom" fire control. IPS-280 High sensitivity K-Band CW Doppler Radar with adjustable frequency and I Q - outputs. Type 285P with five element Yagi antenna with combined Tx / Rx function. United States Naval Institute Proceedings.Polmar, Norman (July 1981). Type 271. Fitted to HMS Sheffield. "The U.S.Navy: Shipboard Radars". 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 (e.g. First British ship-based radar system. Original Type 291 had a hand-steered antenna, replaced by Type 291M with power training and plan position indicator.

Fitted on Bofors mounting Mark IV "Hazemeyer" and Main armament anti-aircraft barrage fire control set fitted to "barrage director" for cruiser 6-inch (150 mm) and battleship guns.


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