Note that I didn't mess withthe dates, I just nulled the type13. Some ships in stock sh4 get type13 in october 42. The rest in sept 43. In reality the later date is more likely for escorts---if it wasn;t functionng as surface search.
Type 21 would have been rare on escorts, and wasn't around til aug 43.
Type 22 was late 44.
Quote:
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Type 22 fitted to Kazegumo and Makigumo in March 1942, Hamakaze in June 1942, Akigumo and Yugumo in July 1942, Kongo, Haruna and Hyuga in October 1942, Katori, Kashima and Kashii in June 43,Yamato and Musashi in October 1943, other destroyers prior to September 1944. In wide use by mid-to late 1944. Type 22 radard while not designed for gunnery control provided moderately accurate data for this purpose.
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So a few fleet DDs would have this capability early. For SH4, we have Asashio, which is the stand-in for all the DDs mentioned in that quote. IF we want a special "radar" variant for early war, we could "bungo pete clone" Asashio and add surface radar in march 42. On generic DD pulls, it would mean 1 in 7 would be radar equipped.