Gmdss : Element 7 - 499/600
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| In FM communications, the information is applied to the carrier by: |
| A) Varying the amplitude or the frequency of the carrier, depending on Double or Single-Sideband operations. |
| B) Varying the frequency of the carrier. |
| C) Varying only the frequency of the carrier, depending on Double or Single-Sideband operations. |
| D) Varying the amplitude of the carrier. |
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