What is the maximum FM deviation for voice operation of a normal wideband channel on VHF and UHF?

The maximum FM deviation for voice operation within a normal wideband channel on the VHF and UHF bands is 5.0 kHz. This limit is established to ensure that the signal remains clear and less susceptible to interference, which is crucial for maintaining the quality of voice communications.

The 5.0 kHz deviation represents a balance between achieving sufficient audio fidelity while preventing excessive bandwidth usage. In the design of communication systems, adhering to this standard helps to minimize overlap between adjacent channels, enabling more efficient use of the available spectrum and reducing the potential for interference between signals.

In contrast, other deviation values mentioned in the options either do not conform to standard practices for voice operation or might relate to other types of emissions or applications outside of the normal voice communication parameters set by regulations. This ensures that operators and equipment can maintain effective communication without excessive distortion or interference.