Simple Subsidiary Communications Authorization (SCA) Adapter

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Simple Subsidiary Communications Authorization (SCA) Adapter

by KirtB » Mon Jul 24, 2017 4:14 pm

Simple Subsidiary Communications Authorization (SCA) Adapter

Unlike Radio Broadcast Data System (RBDS) which is responsible for your FM radio being able to display song title and station identification via a digital subchannel (began in 1992), Subsidiary Communications Authorization (SCA) has been around as an analog subchannel for more than half a century. SCA (was) used for tasks such as book reading for the blind, telemetry, paging services, and most familiarly - Muzak (aka 'elevator music'). This article presents a simple circuit for stripping the subcarrier off of the FM broadcast signal to permit a listener to avoid commercials, PSAs, weather reports, and other items that are played between songs ... http://www.rfcafe.com/references/popular-electronics/simple-sca-adapter-popular-electronics-june-1970.htm

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