A satellite radio or subscription radio (SR) is a digital radio that receives signals broadcast by communications satellite that covers a much wider geographical range than normal radio signals.
The satellite radios function anywhere there is line of sight between the antenna and the satellite, given there are no major obstructions, such as tunnels or buildings. SR audiences can follow a single channel regardless of location within a given range.
As the technology requires access to a commercial satellite for signal propagation, SR services are commercial business entities (not private parties), which offer a package of channels as part of their service ?requiring a subscription from end users to access its channels.
The satellite radios use the 2.3GHz S band in North America, and generally shares the 1.4GHz L band with local Digital Audio Broadcast (DAB) stations elsewhere. It is a type of direct broadcast satellite, and is strong enough that it requires no satellite dish to receive.
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Source: http://www.saintpaulchefs.org/?p=2094
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