Radar Dish

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19th Apr 2010, 11:35

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bigbob

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Radar Dish

Anyone know why some rotating primary radar dishes have a fin at the back?

Cheers,

Bigbob.

19th Apr 2010, 11:55

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Spitoon

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Don't know for sure - never thought about it before - but I would guess it's something to do with reducing or balancing the effects of wind on rotation of the antenna.

19th Apr 2010, 14:36

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welliewanger

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I don't know for sure either. Spitoon's theory that it's to balance aerodynamic forces sounds reasonable. I'd always thought (guessed) that it was used as a counterweight.