Connection of two points by non-visible electromagnetic waves is known as radio link
Fig 2.1 Radio Links
Types
§ Extremely Low Frequency(ELF)
§ Very Low Frequency(VLF)
§ Low Frequency(LF)
§ Medium Frequency (MF)
§ High Frequency (HF)
§ Very High Frequency (VHF)
§ Ultra High Frequency (UHF)
§ Super High Frequency (SHF)
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