What is the channel spacing for MF-HF voice frequencies?

The channel spacing for MF-HF voice frequencies is set at 3.0 kHz. This specification is important for ensuring that channels are sufficiently separated to minimize interference between adjacent frequencies. In the context of radio communications, particularly in maritime situations governed by the Global Maritime Distress and Safety System (GMDSS), having standardized channel spacing helps maintain clear and effective communication between vessels and shore stations.

When considering voice transmissions within the MF-HF bands, this 3.0 kHz spacing accommodates the required modulation characteristics while allowing for proper frequency allocation among users. It's essential for ensuring reliable communications, especially in scenarios where multiple stations are operating in proximity.

The other options present alternative values that do not align with the standardized channel spacing for MF-HF voice frequencies. These incorrect choices highlight different considerations or parameters relevant to other parts of frequency allocations but are not applicable to the specific context of MF-HF voice frequency channel spacing.