Show static disturbances atmospheric disturbances known ns as static or strays are the greatest obstacles to perfect radio reception the roost most common type produces pro ducet a frying or grinding noise in the phones and for this reason Is called grinder static tile the second type caused by lightning flashes gives a slier sharp p c cloch tic it tile third type creates a hissing noise and frequently occurs during a heavy snowstorm the lightning clicks rind and hissing static produce little interference with communication because they are generally local and last only a few hours static Is generally at a minimum at 1 30 a m and just after dawn its maximum strength in IB reached from 10 p m to midnight o radio digest 1 r |