3. the satellite is floating above the counter station signals over 30000 km, surface of the Earth by using satellite serves as a signal to proceed against the use of this system, stations can make communication very far away.4. the radar system. This system is used in the detection of foreign objects by sending out waves, microwaves. In a narrow sense, to affect objects that are far away. 5. Microwave System. This system is sending waves microwaves that have a narrow space that is in place with the metal. This is a reflection of waves, microwaves, the microwaves cause waves of metal scattered space that can be used in cooking.
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