HF radio transmission
76 NGT Transceiver Getting Started Guide
Sky wave
The sky wave is the most important form of HF propagation.
The HF radio wave is transmitted toward the sky and is
reflected by the ionosphere to a distant receiver on earth.
The reflective properties of the ionosphere change throughout
the day, from season to season, and yearly.
Figure 7: The reflective properties of the ionosphere
ionosphere
transmitter
receiver
emitted HF
radio wave
reflected HF
radio wave
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