FrSky R9 and R9M radio control system is the first FrSky long range system which works in the frequency of 900MHz. The R9M module offers 4 switchable RF power outputs to so you can choose the appropriate power for different flight situations. Compared to another FrSky 2.4GHz long range receiver like the L9R, the R9 receiver has a longer operating range up to 10KM and above. Moreover, the R9 is also a redundancy receiver which can connect to another receiver to ensure the security of your aircraft.
R9 MM Description
The FrSky R9 MM is the latest 900MHz mini receiver in the long-range series. It carries on most of the features from the previous R9 Mini receiver, like it’s super low latency, high precision performance in an extremely compact design. A new feature incorporating an inverted S.Port output makes it compatible with more devices.