The digital STL audio and video transmission system is a professional system which can transmit 4 stereo (or 8 mono) analog/digital audio signals and 1 digital video signal wirelessly from the studio to the transmitting station. The system uses state-of-the-art software-defined radio (SDR) technology, digital code modulation, digital demodulation and decoding to transmit and receive, enabling audio/video signals to be transmitted at very high quality and with virtually no damage.

One set of standard configuration STL system equipment has a transmission distance of 60 kilometers in line of sight. The transmission system consists of STL transmitter, transmission filter, transmitting antenna & feeder cables, receiving antenna & feeder cables and STL receiver.