frsky r9 mm. In this FrSky r9 mm review we are going to look at the characteristics of the FrSky r9 mm receiver, which is a full range telemetry receiver, that supports telemetry, Inverted and Un-Inverted S.Port, and it features with low latency. It has 4 PWM analog outputs and up to 16 channels in SBUS mode. It is lightweight and small (Dimensions: 16×10×2.8 mm (L×W×H) & Weight: 0.7g (Without antenna).

In addition, the FrSky r9 mm shares similar specifications to the previous R9 receivers, but with the already mentioned inverted and un-inverted S.Port and low latency, and the antenna comes with an Ipex type connector.

The FrSky r9 mm may look the same as the FrSky r9 mini at first sight, but the truth is that both have a quite important difference, the FrSky r9 mini receiver supports the redundancy function, that allows you to have another receiver so that this second receiver will act as a backup to the other one in case of failure.

In contrast, the FrSky r9 mm supports the Inverted and UN-Inverted S.Port function, that allows you to use S.Port and F.Port in F4 flight controllers without bi-directional inverter, this gives you the possibility of using the telemetry of the receiver with S.Port protocol or using the telemetry and signal of the receiver with the F.Port protocol. If you are using an F3 or F7 flight controllers instead, you can also do this by the regular S.Port output.

The FrSky r9 mm is compatible with the R9M and R9M Lite receiver modules, so it can be bound to any of this receiver modules, although you will have to make sure that your receiver firmware and antenna matches the antenna and firmware of the module according whether if you are using Non-EU antennas and firmware, or EU Version antennas and firmware.

FrSky r9 mm Features

Channels: As mentioned before, the FrSky r9 mm has 16 channels in SBus and FPort protocols with telemetry and 4 PWM analog outputs. For this reason, the FrSky r9 mm is one of the most suitable receivers for any quadcopter or aircraft thanks to its range of possibilities. The pinout of the receiver is the following:


Compatibility: The FrSky r9 mm can only be bound to a R9M and R9M Lite transmitter module with an antenna of 915MHz (Non-EU Version) or of 868MHz (EU Version). This means that according to where you are going to fly you will need a specific equipment for best performance.

For example, in the European union you should use 868MHz antennas in both module and receiver which you can select when you buy them, and you will also need to have the EU firmware in both devices if you don’t have it already in order to have it working properly.

Conversely, outside the European Union you should use 915MHz antennas instead and also in both module and receiver which you can also select when you buy them, and you will also need to have the Non-EU firmware version in both devices if you also don’t have it already, also in order to have it working properly.

Other Features: 

The mini size, the superlight weight, the low latency and the high precision provided by the FrSky r9 mm make it a better option comparing it to other previous receivers of the r9 series. This receiver also supports battery voltage detection by the telemetry data transmission and has the already mentioned detachable Ipex connector antenna.


The operating voltage range of the FrSky r9 mm is between 3.5V to 10V, and with an operating current of 100mA when connected to a 5V power supply. Nowadays, many power supplies in flight controllers and in PDB’s in this range of voltage are capable of handling this little current draw and even more, they are usually capable of supply between 0,5A up to 2A, so this won’t be an issue at the time of building your aircraft.

The last impressive fact about this FrSky r9 mm is that it is one of the few receivers which its operating range is up to 10 Km or even more. This makes the FrSky r9 mm a unique receiver between others at a low price, as this model can be used for airplanes and quadcopters intended for long range.

The FrSky r9 mm can also be used in any regular aircraft as any other receiver, but this model will give you the confidence to fly farther or to places where the reception signal can be attenuated, thanks to the wavelength of around 915MHz which penetrates objects better than the 2.4GHz wavelength signal.