The radar, both SJ and SD, are both controlled )n/Off by the Radar Antenna themselves, and their relationship to the water.. There are various types...all have the same function. If the antenna is above water.......it works; if it's below water......it doesn't. There is no set meter/yard/feet figure that effects the function. It's purely where the antenna is positioned in relationship with the water line that causes it to either turn On/Off.
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The HMS Shannon vs. USS Chesapeake outside Boston Harbor June 1, 1813
USS Chesapeake Captain James Lawrence lay mortally wounded...
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.."tell the men to fire faster, fight 'till she sinks,..boys don't give up the ship!"
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