marine radio types

Marine radio communications are divided into two types: shortwave single sideband communications and ultra-shortwave communications.

The frequency range of shortwave single sideband communication is 3~30MHz and is generally used for long-distance communication.

The frequency range of ultrashort wave communication is 30~300MHz, which is generally used for short-distance communication. Ultrashort wave communication, also known as very high frequency (VHF) communication, is an important communication channel between ships and ships, and between ships and land shore stations during navigation.

According to the unified regulations of international maritime communications, the operating frequency range of marine very high frequency (VHF): the transmitting frequency is from 156.025 MHz to 157.425 MHz; the receiving frequency is from 156.025 MHz to 163.275MHz.

There are 88 marine very high frequency (VHF) channels, of which 16 are marine emergency frequencies, 29 to 59 are empty, and * is low power 45. Different channels have different uses and rules. For example, channel 70 is a VHF DSC distress alarm channel, and channel 16 is a channel reserved for distress and safety calls.

Marine radio communications should follow some basic principles, such as giving absolute priority to distress calls or messages, speaking concisely, and maintaining effective listening, etc.

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