AKG CSX-IRT4 10-Channel Infrared Near Field TransmitterThe CSX IRT4 10 Channel Infrared Near Field Transmitter from AKG transmits up to ten language channels designed for near field use, with a radiation angle of 60 to cover the distance of up to 115'. Using PPM (Pulse Phase Modulation) technology, all LEDs cover the same area and distance, regardless the number of channels needed in an application. Hence, exact coverage is ensured even if channel needs change. The CSX IRT4 can be cascaded almost without