The Ultrasonic Bird Deflector uses a Doppler radar for the recognition of birds. When a motion is detected, the instrument runs fast movements with a beating arm. The beating arm is designed in a way that the birds are not hurt with contact, but are startled only by this unexpected movement.The instrument is equipped with a microcontroller, and can be configured via a serial RS485 interface. A switching output can be used to transfer, for example, a signal to other instruments.In order to prevent the beating arm from freezing, and to avoid a blocking of the servomotor the ultrasonic bird control is equipped with a controlled heating.• suitable for Ultrasonic Anemometer 1D, 2D