But radar has nothing to do with noise or... I know that the German "Boot's" had a limited angle on their radar, a sort of 30-45 dgr "static" arc in front of the boat. I guess the American system was different as they developed radar together with the Britt's.
Short on US Radar
Quote:
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RADAR (Radio Detection And Ranging) was initially installed on US sub's during the latter part of 1941 when the USS Plunger field tested the first version during an actual war patrol. It was a rather primitive and unreliable setup called the SD. Having a limited range (6 - 10 miles), it was non-directional and primarily useful in detecting enemy aircraft.
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http://www.valoratsea.com/radar.htm
Acording to that article Radar was improved around 42-43