Together with the PTRL-LCD this device makes an exelent STL ( Studio - Transmitter Link) The Mono and MPX outputs can be connected to the transmitter directly or we can use the optional Left and Right output  for stereo signals. 

PTRL-LCD and RXRL-LCD are a broadband radio transmitter and receiver designed to carry audio signals to support sound FM radio broadcasting. This type of device is also known as STL (Studio-to-Transmitter Link).  This transmitter in combination with the RXRL-LCD makes sure you can benefit the key audio features like low distortion and intermodulation values and a high noise/signal ratio.