Just a little off air recording of some local stations talking with FreeDV RADEV1.
Joe VK3SRC asked about those "wings" (as he called them) on either side of the main carriers. He hypothosised that they were extra error correction signals. In fact they are an unwanted side-effect of the current RADEV1 code that will be removed in a future version.
To test this he used filtering in his transmitter to nicely remove them. You can see a "normal" signal at the bottom and his frequency limited signal above:
The resulting signal was perfectly decoded and has less wasted transmitter power.
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