A 1998 apparent describes a accessory that can alarm off birds from wind turbines, aircraft, and added acute installations by way of bake activity pulses. Using frequencies from 1 GHz to about 40 GHz, the admonishing arrangement generates pulses of milliseconds duration, which are claimed to be sensed by the birds' audition systems. It is believed this may could cause them to veer abroad from the adequate object.6
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