Who uses HF radio?

The band is used by international shortwave broadcasting stations (2.310 – 25.820 MHz), aviation communication, government time stations, weather stations, amateur radio and citizens band services , among other uses.

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What is frequency class11?

Frequency is the number of vibrations or the number of occurrences of a repeating event per unit time . The frequency is measured in terms of Hertz. In sound, the frequency is in the form of waves, so here frequency is defined as the number of waves that pass a fixed point in a given amount of time.

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