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In __, the amplitude of the carrier wave is changed to transmit information; the frequency is not changed.

In __, the frequency of the carrier wave is changed

__ phones and __ phones use radio waves to transmit signals.

__ use electromagnetic signals from a base station

Communication __ enable radio signals to be sent from one part of Earth to another

The __ consists of satellites, ground-based stations, and portable units with receivers used to help locate objects on Earth.

  • Science -

    AM; FM; cell phones; cordless phones; radio and television; satellites; GPS system

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