The NTRI made minimal changes to the 60-cm (500-MHz) The prototype for the Type 22 was completed in October 1941; tests showed that it detected single aircraft at 17 km, groups of aircraft at 35 km, and surface ships at over 30 km (depending on the height of the antenna above the sea). However, a lack of appreciation of radar's potential and rivalry between army, navy and civilian research groups meant Japan's development was slow. The PRP was adapted from the British Army GL, Gun Laying, radar system, and first went to sea in 1939 aboard several C-class cruisers, using the Type 280 radar. Before the end of the year, they had built a set based on their In early 1941, Air Defense recognized the need for radar on their night-fighter aircraft. Most originated in the Rad Lab where some 100 different types were initiated. The maximum range was about 40 km. Before the end of November, the various elements of the system were completed, all by using locally available components. 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. Designated The Navy, however, ignored further development, and it was not until January 1939, that their first prototype system, the 200-MHz (1.5-m) Taylor's 1930 report had been passed on to the U.S. Army's In Europe, the war with Germany had depleted the United Kingdom of resources. These programmes were for a Gun Laying (GL) system to assist aiming antiaircraft guns and When war started and Air Ministry activities were relocated to GL Mk. Another similar system was the Type 21. Radar During World War II . Upgrades followed those of the original 271 series. The Imperial Navy built two radars based on the captured SCR-268. Even when deflating the World War II radar myths, it is important to realize that even though the British initially deployed a more primitive radar design, they had developed the correct strategy to defeat the German air campaign. The mean errors were no more than 120-m in range and 0.8-degrees in azimuth and elevation angles. In February 1943, a British bomber containing a Telefunken was commissioned to build a gun-laying set for Several other 10-cm sets were developed, but none made it into mass production. Reduced 4-foot (1.2 m) antennas in aerial outfit AUS. This was to incorporate many simplifications to the SCR-268.

Also, the reflex klystron had not been put into production and its availability in the future was doubtful; therefore, the project was terminated. The Rad Lab was assigned three initial projects: a 10 cm airborne intercept radar, a 10 cm gun-laying system for anti-aircraft use, and a long-range aircraft navigation system. Only two systems were developed for these aircraft: Taki-1, an airborne surveillance radar in three models, and Taki-11, an airborne electronic countermeasures (ECM) set. From this came the Tachi-3, a ground-based tracking radar. Main armament ranging and shot-spotting set for Combined the electronics of the Type 277 and the stabilized mounting of the Type 273. 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. Both systems had a range of about 40 km. The British, faced with the most urgent need to deploy equipment, designed the Chain Home system to work at 25 MHz. (A similar development had been made for the Several techniques for replacing the null-reading methods were considered, with the final selection making use of a fixture to provide a stationary dipole against which the directional position of the antenna could be continuously determined. Of these, 12 types were turned over to the REL where they were built in quantities varying from a few to hundreds; altogether, some 3,000 were produced before the REL was closed in September 1946.In late 1939, the New Zealand Department of Scientific and Industrial Research (DSIR) established two facilities for RDF development – one, led by Charles Watson and George Munro (Watson-Munro) was at the Radio Section of the Central NZ Post Office in The objective of the Wellington group was to develop land-based and airborne RDF sets for detecting incoming vessels and a set to assist in gun-directing at coastal batteries. Used a single transmit/receive antenna, Follow on from Type 79, metric air warning set. Multiple receiver stations were spaced about 100 m around the transmitter.

A gas-discharge transmit-receive device (a diplexer) was developed for isolating the receiver from the direct transmitter pulse, thus allowing the use of a common transmitting-receiving structure. The Type 41 was electronically like the original, but with two large dipole array antennas and configured for shipboard, fire-control applications. It used a Yagi antenna that was rigidly mounted above the shelter and the entire unit could be rotated in azimuth. For these, they developed Tase-1 and Tase-2, both anti-surface radars.
Radar - Radar - Advances during World War II: The opening of higher frequencies (those of the microwave region) to radar, with its attendant advantages, came about in late 1939 when the cavity magnetron oscillator was invented by British physicists at the University of Birmingham.

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