Broadcast auxiliary service

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A broadcast auxiliary service or BAS is any radio frequency system used by a radio station or TV station, which is not part of its direct broadcast to listeners or viewers. These are essentially internal-use backhaul channels not intended for actual reception by the public, but part of the airchain required to get those signals to such a transmitter.

Examples include:

2GHz relocation[edit]

In the United States, the Federal Communications Commission (FCC) moved TV channels in the 2 GHz TV BAS band. This was done at the request of Sprint Nextel, so that it could use the current BAS band, which is adjacent to PCS frequencies it already uses. The report and order resulting from this rulemaking specified that Sprint/Nextel must pay for every TV station in the country to buy and install new BAS equipment to equally replace what they have now (although not every station uses BAS).

Previously, there were seven analog TV channels, each 17 or 18 MHz wide, between 1990 and 2110 MHz. There are now seven new digital TV channels, each 12 MHz wide, from 2025 to 2110 MHz. There was also a "narrowed in place" bandplan used as an interim measure, as the two bands overlap. Begun in 2005, the relocation was 94% complete as of October 2008, and was expected to be fully complete in mid 2009. After multiple extensions granted by the FCC, it was finally done in July 2010, with the completion of the Anchorage, Alaska TV market.

The cleared band will now be used for PCS, AWS, and MSS services, including mobile broadband.

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