When in the Appliance Settings window, make sure to have the USB Controller, Sound Card, and Network Adapter checked. ova file you just downloaded (the ubuntu 15.04 image). Open VirtualBox, select File->Open Appliance, and select the. If you don't have a torrent client, you can use an older version use the sourceforge link. (Ubuntu Linux 15.04, at the bottom of the page). I also recommend downloading the extension pack, also on that page. In his video he also explores the FM MPX spectrum, showing the different components, and also how to install and use RDS Spy for decoding RDS.First, download VirtualBox HERE. In the second SDR# instance you can then directly tune into the SCA channel. The idea to to use a virtual audio cable to pipe the FM Multiplex (MPX) audio output from one instance of SDR# to another. Over on YouTube channel Double A has uploaded a video showing how to decode these SCA subcarriers using an RTL-SDR, two SDR# instances and the MPX Output plugin. Not all broadcast FM stations will have an SCA service, but the video shown below explains how to find one.
In the past you needed a special hardware SCA radio to receive these channels, however receiving these channels with an SDR is relatively simple. SCA is typically used for niche radio programs, elevator music, music for doctors offices, and niche services such as reading for the visually impaired. A common subcarrier is Radio Data System (RDS), and this is what provides song and radio station text information to your radio.Īnother less commonly seen subcarrier is the Subsidiary communications authority (SCA), which is a separate audio channel hidden within the broadcast FM signal. Broadcast FM channels can often contain additional subcarriers hidden within the bandwidth.
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