| 31. | The transponder sends the data outside the tire through a wireless radio signal.
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| 32. | Most radio signals are transmitted on a single, relatively narrow, frequency.
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| 33. | No reliable radio signal from an alien civilization has been detected.
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| 34. | The jamming blocks much of the radio signal and virtually all television signals.
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| 35. | The repeater amplifies radio signals so they can travel longer distances.
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| 36. | The light is lit on demand by ships using radio signals.
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| 37. | The flashes are accompanied by distinctive crackling and popping radio signals.
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| 38. | We need antennas in all high-rise buildings to enhance radio signals.
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| 39. | The transmitter emits a radio signal but does not work underwater.
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| 40. | The project effectively decoupled the analog and the digital radio signals.
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