FM Stereo Encoder

Nowadays many radio stations can be heard in stereo on the FM band.
This is possible because they have a stereo FM transmitter, but this is also possible with a mono FM transmitter and a stereo encoder.
Stereo encoder is then an extra separate device which ensures that the mono FM transmitter can still broadcast in stereo.
This can be a solution if your mono transmitter is still working fine and you do not want to replace it with a new stereo transmitter.
Some Stereo encoders also have RDS or an audio Processor, multiple brands and versions can be found in this section.