Gmdss : Element 7 - 498/600
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| In an AM signal using voice: |
| A) Varying the amplitude of the carrier and employing both sidebands without the carrier. |
| B) There is a constant amplitude carrier with complex upper and lower sidebands varying in amplitude and frequency. |
| C) Varying only the amplitude of the carrier, depending on Double or Single-Sideband operations. |
| D) Varying the amplitude of the carrier and employing both sidebands and the carrier. |
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