We have already looked at the FrSky R9M Lite in a previous article. In this article, we will go more in-depth regarding the FrSky R9M Lite and look at its usage and its characteristics and also compare it with the full-sized R9M module along with the R9M Lite Pro module as well, which are the 3 R9 Long-Range systems provided by FrSky for commercial use for drone pilots and others alike.

 

Why Choose the R9M Lite?

So why would anyone choose the R9M Lite when you could get the full-sized R9M? The reason has to do with the form-factor of the X Lite series of transmitters from FrSky. These transmitters (and even the new Team-Black Sheep Tango II) all have a mini version of the standard JR module bay. This bay has been designed to reduce the space requirements for a full-size module and also, perhaps to reduce the overall weight of the transmitter with a module to make it easier to carry and hold. Makes you wonder why the JR module bay was so big, to begin with, doesn’t it?

If you have an X Lite series or the Team Black Sheep Tango II radio and want to use R9 system, instead of 3D printing parts for the adapter for the full-sized module, you can get this module to fit perfectly on your radio without any modifications (except for the Team Black Sheep Tango II, because you will need to mod it to have JR bay support. But why would you want to use FrSky R9M system when you already own a Team Black Sheep Tango II radio with the same 900MHz system, that too with 250mW (which should be upgradeable to 1W soon)

 

Connection

 

Connecting the FrSky R9M Lite to your transmitter is quite easy. All you need to do is plug in the module to the back of your X-Lite radio or whichever is your prefered radio and that’s all the hardware connection for the transmitter module is.

The above picture shows the mini JR module for the X-Lite transmitter. It is completely different from the standard JR module bay.

The above image shows the FrSky R9M Lite connected to the FrSky X-Lite radio and different R9 series of 900MHz receivers as well.

 

Firmware

 

The firmware for the R9M and the compatible receivers are all in the Open-TX firmware for your transmitter radio. You can enable LUA scripts etc in the radio after you install Open-TX.

 Firstly, you will need to update your FrSky R9M lite and the receivers. To do this, go to the settings of your radio and on the page with SD card files, scroll till you find the right firmware which you should download from the FrSky site and paste on your SD card before trying to flash the transmitter module. Once you have found the correct firmware, long-press the menu button to bring up the flashing settings where you can choose between S.Port or Internal module or external module. While flashing your module, choose the external module option and your FrSky R9M lite will be flashed with the latest firmware. Likewise, for your receiver, choose the “S.Port” in the menu for flashing.

 

 

Setup

 

To set up your module, you will need to go to the “setup” menu in your transmitter and select External RF as the choice for your RF output. In that select R9M FCC if you’re not in the EU or select LBT if you’re in the EU and other options as shown in the below image.

 

You may select the required RX number and bind your RX to your module (TX) to get that working. The RF power can also be changed from 10mW to 100mW depending on how far do you wish to go.

It is recommended to do a range check before your first flight by pressing the “[Rng]” option on the screen and walking away from the receiver to actually see that you are able to go a few meters before the range cuts out. If it cuts before a few meters, then you may have a faulty product or too much noise in the area.

 

 After these settings are applied, you are ready to start flying!

 

Conclusion

In this article, we have seen how to get started with the FrSky R9M Lite transmitter module and how to set it up for the first time. The module is quite easy to get up and running due to the compatibility with FrSky radios and Open-TX firmware.