Natural spectral lines

Certain ranges of frequency across the electromagnetic spectrum are reserved by regulators for particular applications: TV, digital radio, Wi-Fi, Bluetooth etc. Unregulated devices are precluded from broadcasting on these spread frequencies. However, much of the bandwidth is unused across vast swathes of the planet and could be used by other devices, but for those legal constraints.

from Phys.org - latest science and technology news stories http://bit.ly/2wq5ISy

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