What is MF HF and VHF?

Digital selective calling or DSC is a standard for transmitting pre-defined digital messages via the medium-frequency (MF), high-frequency (HF) and very-high-frequency (VHF) maritime radio systems . It is a core part of the Global Maritime Distress Safety System (GMDSS).

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What frequencies are considered UHF?

The UHF (Ultra High Frequency) band spans from 380-512MHz , exception being the 420-450 MHz band, which is an Amateur Radio band and generally excluded from in-door RF coverage enhancement. 450-470 MHz – Land-Mobile Radio band. Allocated for use by Police, Fire, Government, business, and other 2-way radio services.

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