GMDSS: Element 7

1. A Varying the amplitude of the carrier and employing both sidebands without the carrier.
2. B There is a constant amplitude carrier with complex upper and lower sidebands varying in amplitude and frequency.
3. C Varying only the amplitude of the carrier, depending on Double or Single-Sideband operations.
4. D Varying the amplitude of the carrier and employing both sidebands and the carrier.

Tip: press A-D to answer