I don't know specifics about German 1940's radar. But you can pulse a stronger signal out of a small waveguide, without liquid cooling. A signal so strong that several seconds would actually melt the waveguide. I have always imagined this was so, and the necessary active air-cooling would be the way to go on a submarine.
So your rotating antenna would have to be rotated at a rate that allowed strong pickup. Remeber that time out and in is on the order of 100ms.
That they modeled it within the game doesn't say all that much, unless they have also modeled the antenna accurately. The one time all this occured to me, I figured the easiest way to do things would be to just limit the rate at which you can spin the the antenna bearing. I'd expect that later radar versions could spin faster, but I've never take a watch to time a full rotation.
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