if your after info on japanes radar ext. then this is the only book that i could find that had any info
http://www.amazon.co.uk/Radar-Histor...8953135&sr=1-8
hope that it helps as its mostly german and UK/US stuff. 
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Running subs aground since SH1 and Silent Service
Running SH5 @ 100% difficulty + TWoS 2.2.19(RealNav + BDU + port smoke + food) + Carotio_IntercontinentalRadioPack tweaked + The Little Ships of SH5 - Coaster Pack
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