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Broadcast Radio Subcarriers or Subsidiary …
https://www.fcc.gov/media/radio/subcarriers-sca
For stereophonic FM stations, the multiplex subcarriers (two or more) must be located between 53 kHz and 99 kHz. The arithmetic sum of all multiplex subcarriers may not exceed 20% modulation (15 kHz) (where 100% is 75 kHz deviation from the carrier). The arithmetic sum of all subcarriers above 75 kHz may not exceed 10% (7.5 kHz).
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/
September 3, 2021 Receiving the ‘Hidden’ Broadcast FM SCA Audio Subcarrier with an RTL-SDR and SDR# Broadcast FM channels can often contain additional subcarriers hidden within the bandwidth. A common subcarrier is Radio Data System (RDS), and this is what provides song and radio station text information to your radio.
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...
FM SCA Information - Black Cat Systems
http://www.blackcatsystems.com/radio/sca.html
The subcarrier receiver is a bit harder to come by. Build your own. The LM565 PLL IC is the heart of the circuit. It sells for about $3. Little else is required. Ramsey Electronics (793 Canning Parkway, Victor, NY 14564, 716-924-4560) sells their SCA-1 kit for about $30. It is based on the LM565, and includes an audio amp.
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