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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.
Satellite subcarrier audio - WikiMili, The Best Wikipedia ...
https://wikimili.com/en/Satellite_subcarrier_audio
Satellite subcarrier audio is audio transmitted by way of satellite that uses a separate analog or digital signal carried on a main radio transmission (usually video) on a specific satellite transponder. More technically, it is an already-modulated signal, which is then modulated into another signal WikiMili Satellite subcarrier audio
What is a Subcarrier Signal? Definition from …
https://www.techtarget.com/searchnetworking/definition/subcarrier
Subcarrier signals are used in radio broadcasting for a number of purposes. The main signal is a mono audio signal. A subcarrier contains the stereo audio. Additional subcarriers may contain small text messages, pager information or an additional low-fidelity audio channel.
Subcarrier Radio: The Stations Your FM Radio Can’t Access
https://tedium.co/2020/12/01/radio-subcarrier-talking-book-history/
The audio signal for a subcarrier service typically arrived at the station’s FM transmitter site via an equalized telephone line. From there, it usually went through some form of audio processing, and on to the station’s subcarrier generator and then to the exciter.
Subcarrier audio : RTLSDR
https://www.reddit.com/r/RTLSDR/comments/1dslqu/subcarrier_audio/
The article on wikipedia about "Subsidiary_communications_authority" says this: "the baseband audio (recovered from the discriminator of the FM receiver before multiplex decoding or filtering) is fed into the receiver's RF (antenna) input and the radio tuned to the subcarrier frequency (typically between 53 and 94 kHz, 67 and 92 are common) to ...
FM SCA subcarrier audio receiver - YouTube
https://www.youtube.com/watch?v=wYPA8NNFC7w
Subsidiary Communications Authorization (SCA), or subcarrier, is a method used by FM radio stations to provide additional services and audio broadcasts, such...
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