Hello. The RN started equipping their escorts with the Type 271 10cm radar in March of '41, so by January of '42 one should assume that all escorts have radar. Surfaced convoy attacks become increasingly risky through '41 as more and more escorts are outfitted with the Type 271 radar. It's possible you encountered a veteran destroyer crew in February of '41. They were already getting quite experienced at that point in the war. Finally, I remember reading somewhere that a few RN destroyers were equipped with crude 1.5 or 1.7 meter wavelength radars in '40 and '41, but I can't find the source for that information right now. It's possible that you encountered a destroyer equipped with one of these early radar sets.
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