Modern PLL Synthesizer RF module for the GRAUPNER/JR mx-24s FM transmitter. The transmitter frequency you wish to use is selected using the dual-function rotary encoder on the mx-24s transmitter. The set channel is displayed clearly on the transmitter's integral screen. The transmission frequency is generated automatically by the Synthesizer system with great accuracy; no transmitter crystal isrequired. The TS SYN FM PLL Synthesizer transmitter RF module can only be used in the mx-24s transmitter. The transmitter can be converted to a different frequency band; this work has to be carried out by the GRAUPNER Service Centre.