[Milsurplus] DFing The LOs?

[Hubert Miller]

Looking up some info on 'bilberry',  I came across this
"....there is no documented evidence that the pilots actually ate bilberry jam. Some accounts suggest that the rumour was spread by the military to distract the Germans from the fact that the British were testing radar equipment on their planes. In some versions of the story, it were carrots that was the cause of the pilots success.
While the dietary habits of the World War II pilots are debatable, the supposed benefits of bilberries for the eyes did arouse researchers' interest...." 
( From: https://www.mcgill.ca/oss/article/nutrition-you-asked/it-true-bilberries-are-good-eyes )

I had no idea of the carrot part of the story, and the "Carrot Museum" page is quite a revelation and amusing besides.  ( http://www.carrotmuseum.co.uk/ww2seeinthedark.html ) 
It certainly could use some editing, though. 

When did microwave radar appear with the Allies ? It would have to have been, I suppose, early 1943, because it helped win the Battle of the Atlantic. Certainly the Reich knew about airborne
radar before this, although not microwave radar. 

Re German wartime technology, I just skimmed an article that said the 'Zimmerit' anti-magnetic mine past applied to German tanks added five days to the production of the Tiger tank. That's what
It said. That includes pasting it on and heat treating it. The article said contrarywise, only the Germans had magnetic mines ! I don't however believe that without reservation; I thought I'd read
that the Soviet army had those. In any case, probably not even a major concerning threat to the panzers. Or in a similar concern, I wonder if the time and probably fantastic expense producing 
the E52 receiver was "worth it", really. Certainly the readout and easy choice of selectivity made it easier to operate than other receivers, but what did it actually deliver that something like a 
RBC or SP-200 series did not ? 
-Hue Miller