- Studio/transmitter link
This is often necessary because the best locations for an antenna are on top of a
mountain, where a much shorter toweris required, but where a studio is completely impractical. Even in flat regions, the center of the station's allowed coverage area may not be near the studio location or within a populated area where a transmitter would be frowned upon by the community, so the antenna must be placed several miles or kilometres away.
Depending on the locations that must be connected, a station may choose either a
point to point(PTP) link on another special radio frequency, or a newer all-digital wired link via a dedicated T1 or E1 (or larger-capacity) line. Radio links can also be digital, or the older analog type, or a hybrid of the two. Even on older all-analog systems, multiple audio and datachannels can be sent using subcarriers.
Stations that employ an STL usually also have a
transmitter-studio link(TSL) to return telemetryinformation. Both the STL and TSL are considered broadcast auxiliary services (BAS).
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