The DUPLEX R9 EX receiver is intended for operation with JETI DUPLEX transmitters in the 2,4GHz band and are fully compatible with the previous version of the DUPLEX. Thanks to the fully digital and bi-directional communication between the transmitter and the receiver there are completely new functions available to the user. One of the most important advantages is the the low susceptibility towards interference, the high range of control operation up to the limit of visibility and the possibility to follow in real time, the onboard state of the model and its functional parts. An additional satellite receiver RSat2 can be used with this JETI R9 EX receiver. This receiver is a full DUPLEX system receiver offering the complete functional spectrum of the system. Instead of classical servo pulses the output of the RSat2 receiver offers a PPM signal only. This PPM signal is then processed by the JETI R9 EX receiver, or by compatible RC equipment which requires a PPM signal at the input.