both versions of the MEW into operation at several sites in Newfoundland, Quebec, and Ontario. In addition to the radar sets previously described, many others were designed at the NRCC's Radio Branch during the war years – a total of 30 of all types. 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. New Zealand 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 Wellington, and the other, under the responsibility of Frederick White, was at Canterbury University College in Christchurch. 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. Within a few months, they had converted a 180-MHz (1.6-m), 1-kW transmitter from the Post Office to be pulse-modulated and used it in a system called CW (Coastal Watching). The CW was followed by a similar, improved system called CD (Coast Defense); it used a CRT for display and had lobe switching on the receiving antenna. This was placed into service at the Devonport Naval Base at Auckland. In this same period, a partially completed ASV 200-MHz set from Great Britain was made into an airborne set for the Royal New Zealand Air Force (RNZAF). About 20 sets were built and put into service. All three of these radars were placed into service before the end of 1940. The group at Christchurch was to develop a set for shipboard detection of aircraft and other vessels, and a companion set for directing naval gunfire. This was a smaller staff and the work went much slower, but by July 1940, they had developed an experimental VHF fire-control set and tested it on the Armed Merchant Cruiser Monowai. This was then improved to become the 430 MHz (70 cm) SWG (Ship Warning, Gunnery), and in August 1941 went into service on the Archilles and Leander, Cruisers transferred to the newly formed Royal New Zealand Navy (RNZN). The same basic equipment was used by the Christchurch group in developing a ship-based air- and surface-warning system. The primary