vhf radio tuned

Marine VHF radios are a type of radio communication equipment used for communication on water. They operate on dedicated frequency bands in the very high frequency (VHF) range and can facilitate radio communication between ships, within a ship, between ship and shore, or through a land station to relay communication to land. Marine VHF radios are widely used for ship avoidance, maritime management, port production scheduling, internal ship management, search and rescue in emergencies, and broadcasting safety information. They are a primary means of on-site communication in maritime traffic.

So, are marine VHF radios required to be frequency-modulated? The answer is yes. Frequency modulation (FM) is a method of radio transmission where the frequency of the carrier wave is varied to transmit the signal. Compared to amplitude modulation (AM), FM offers better resistance to interference and sound quality, and it is also more power-efficient. There are several reasons why marine VHF radios use frequency modulation:

Frequency modulation can enhance the stability and clarity of the signal, preventing signal loss or noise in a noisy aquatic environment, ensuring smooth and safe communication.

Frequency modulation can improve the security of the signal because FM signals are less susceptible to interception or interference by other radio equipment, preventing eavesdropping or disruption of communication content. Therefore, marine VHF radios are indeed required to be frequency-modulated to improve the quality and safety of communication on water. There are two types of frequency modulation methods for marine VHF radios: single frequency modulation (SFM) and dual frequency modulation (DFM). Single frequency modulation refers to modulation within one channel, while dual frequency modulation refers to modulation across two channels, allowing for two-way communication. The method of frequency modulation for marine VHF radios can be selected and switched according to different communication needs and scenarios.

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