Why do marine radio use V-band wave

The principle of intercom communication is to use electromagnetic wave to transmit information in the air. According to Maxwell's electromagnetic field theory, the changing electric field produces the changing magnetic field, and the changing magnetic field produces the changing electric field. The magnetic field and electric field are interdependent, excited, and spread in space at a certain speed from near to far, thus generating electromagnetic waves, the propagation of electromagnetic waves in the real environment, interacting with various media (air, water, buildings, etc.) in space, and following the four characteristics of the wave, reflection, refraction, diffraction and attenuation of the wave.

The frequency of u-segment is 300-3000mhz, and the commonly used frequency of u-segment interphone is generally 400-470MHz. The electromagnetic wave length of this frequency section is short, the only wave peak is narrow, the diffraction ability is weak and the penetration is strong. That is, in the air, the medium will absorb the energy of electromagnetic wave to reduce the transmission distance and greatly reduce the transmission distance, so it is suitable for urban use, For example, shopping malls, hotels, construction sites, etc., these areas are small and require a u-segment marine radio with good penetration.

The frequency of v-segment is 30-300MHz, and the commonly used frequency of V-section interphone is 136-174mhz. The frequency of this frequency band is low, and the displacement between wave peaks is wide. In the air, the ship will reduce the attenuation of medium energy absorption and diffraction ability and weak penetration. Therefore, it is necessary to work with the units in open areas and offshore operations outside the field, This is also the reason why the v-segment electromagnetic wave is used in marine radio.

Some users have questions about whether the v-segment intercom must be used at sea? Can I have a U-section walkie talkie? Actually, it is not. U-segment radio can also be used at sea, mainly according to the user's use needs. If the user does not have strong requirements for the distance, then the u-segment interphone can be used completely, such as some steam ferry scheduling, motorboat and other leisure and entertainment. If the user is fishing at sea, oil exploitation, etc., it is better to choose the v-segment marine radio with long distance.