The following has been summarised from The Ministry of Defence History - Signals Vol 4 - Radar in Raid Reporting to give the reader an insight into this region. The English War Cabinet fully appreciated the strategic importance of Malaya and Singapore and a brief survey was made in 1939 but no equipment was then available. The question was considered again in March 1941 when recommendations were made for the establishment of a Radio Installation and Maintenance Unit (RIMU) and the deployment of one Mobile Radio (Radar) Unit (MRU), one TRU and two COLs to Malaya and Singapore. Immediate action was taken with the MRU and TRU arriving in the same month and the two COLs in April.
MRU No. 250 was soon erected on the south-east side of Singapore Island at Tanah Merah Besar, near Changi. It was a single line-of-shoot system at a bearing of 67 degrees covering the sea approach. Good height measurements were obtained over an arc from a bearing of 20 to 160 degrees.
TRU No. 243, which arrived with MRU No. 250, was ultimately erected at Mersing on the east coast of Malaya about 100 miles from Singapore. Once again, a single line-of-shoot on a bearing of 45 degrees. Performance was affected by large permanent echoes (PEs) from the 2000 ft hill on the island of Pulau Tioman but reasonable height finding was achieved.
The two COLs immediately ran into delays even though sites were selected when they arrived in April 1941. The installations were not completed until December! To quote from page 197 of Chapter 13 of the history:
It was a marked characteristic of the Far East Theatre, that the whole of the RDF [radar] programme was consistently held up by the extreme slowness of the Directorate of Works. Provision of hutted buildings for the COL stations took at least six times the time required for similar work in the United Kingdom, apart from which the huts were badly built and seldom completed.
Part of the reason for this slowness was undoubtedly the extreme peace-time control which the Ministry Auditors appeared to exert over the Chief Engineer.
COL No. 511 was sited at Bulit Chunang, on the extreme southeast tip of Johore overlooking the sea with a clear sweep from 10 degrees over the sea round to 290 degrees covering Singapore and south-west Johore. COL No. 512 was located on the corresponding south-west tip of Johore at Tanjong Kupang.
Three more COL type stations were sent to Malaya and Singapore but once again difficulty was encountered in getting them established. The official MoD History states ‘More often it was just the administrative machinery was not used to or designed for working at any great speed’.
Nevertheless stations Nos 511 and 512 at Bukit Chunang and Tanjong Kupang respectively
became operational at the beginning of December 1941 with No 518 at Kota Tinggi nearing
completion.
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