Which type of modulation is most commonly used in VHF amateur radio operations?

Frequency modulation is the most commonly used type of modulation in VHF amateur radio operations due to its advantages in terms of signal quality and robustness against noise and interference. In VHF frequencies, which range from 30 MHz to 300 MHz, frequency modulation can provide clearer and more stable communications compared to other modulation types.

One of the key benefits of frequency modulation is its capability to maintain audio quality even in the presence of background noise. This is particularly important for amateur radio operators who may be operating in noisy environments or when signals are weak. Furthermore, frequency modulation often allows for narrower bandwidth usage compared to amplitude modulation, making it more efficient in the crowded VHF spectrum.

The other modulation types mentioned have distinct characteristics that make them less favored for VHF operations. For example, amplitude modulation is more susceptible to noise and signal fading, which can degrade the quality of the transmitted information. Phase modulation has its uses, but it is less common in amateur radio due to the complexity of the equipment required to operate effectively. PAM (Pulse Amplitude Modulation) is generally utilized in digital communications and is not standard in VHF voice operations.

Overall, the preference for frequency modulation in VHF amateur radio stems from its effective performance in busy wireless environments, providing clear