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R.C. Distributing : Universal SC-50 Satellite Radio Receiver
http://www.rcdistributing.com/universal_sc_50.php#:~:text=Audio%20subcarriers%20are%20the%20additional%20signals%20attached%20to,are%20all%20offered%20by%20this%20audio%20subcarrier%20group.
Broadcast Radio Subcarriers or Subsidiary …
https://www.fcc.gov/media/radio/subcarriers-sca
A subcarrier, known also as Subsidiary Communications Authority or SCA, is a separate audio or data channel that is transmitted along with the main audio signal over a broadcast station. These subcarrier channels are not receivable with a regular radio; special receivers are required. Subcarriers are used for many different purposes, including (but not …
Receiving the ‘Hidden’ Broadcast FM SCA Audio Subcarrier ...
https://www.rtl-sdr.com/receiving-the-hidden-broadcast-fm-sca-audio-subcarrier-with-an-rtl-sdr-and-sdr/comment-page-1/
A common subcarrier is Radio Data System (RDS), and this is what provides song and radio station text information to your radio. Another less commonly seen subcarrier is the Subsidiary communications authority (SCA), which is a separate audio channel hidden within the broadcast FM signal.
Subcarrier - Private Audio
https://www.liquisearch.com/subcarrier/private_audio
Subcarrier - Private Audio. Private Audio. Before satellite, Muzak was transmitted to department stores on FM subcarriers. The United States Federal Communications Commission (FCC) also allowed betting parlors in New York state to get horse racing results from the state gaming commission via the same technology.
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