Long-range drones are increasingly present on the market, being used in military operations and agriculture, and the range of said drones is connected to its signal frequency, for example, a 900 MHz drone can reach a distance between 7 and 10 km. In general, the higher the frequency, the farther the drone can go. When operated in large centers that have interference from other frequencies, such as radio, TV, and cell phone, this distance can have a considerable drop. 

The combo with the FrSky 900MHz R9M 2019 transmitter module and FrSky R9 MX Long range receiver is the best on the market for building a 900 MHz drone. The quality of these products, pioneers in the industry, provides long-range and more efficient flights when compared to other modules and receivers.

Both the FrSky ACCESS R9M 2019 Long Range Module System and the FrSky R9 MX can be purchased at HorusRC’s online shop (horusrc.com) for just $29.99 and $19.99, respectively.

Transmitter Module

The FrSky 900MHz R9M 2019 consists of a module system with 4 RF power outputs, the R9M can also be used together with another receiver, which provides greater safety for the flight of your aircraft.

The different power output ports allow you to choose the ideal power for each flight situation. The RF power can be 10mW, 100mW, 500mW, and 1W, and at all levels, the use of telemetry is supported. An intelligent port is used for the transmission of telemetry data.


Long Range Transmitter Module FrSky R9M 2019 900MHz

Long-range, low latency, and high precision are the characteristics of the FrSky 900MHz R9M 2019. R9M's power supply is 6.5 ~ 13V. Modulations can be PXX or CPPM, being detected automatically. The R9M is compatible with all R9 series receivers. The frequency varies between 868 ~ 900 MHz. The operating range reaches 10 Km, perfect for the 900 MHz drone used on long distances.


Pin-in and Pin-Out overview of the R9M 2019.

The Smart Port (S. Port) present in the 900MHz R9M is a digital transmission interface developed especially by FrSky. In all products that contain Smart Port, user data from the serial port and other user input and output devices can be connected without limitations for numbers or sequences at high transmission speed, which is very important for a 900 MHz RC drone. 


The module works with 3 failsafe modes: No Pulse, Hold, and Custom. In the first mode, when a signal loss occurs, the receiver does not produce pulses on any channel. The Hold function consists of making the aircraft maintain its last position after the loss of signal (when the failsafe mode is activated). In custom mode, the aircraft will move to the predefined position after a signal loss.


The FrSky R9 MX, another product of great relevance for the construction of a 900 MHz drone, consists of an enhanced version of the other receivers in the R9 MM series, making it compatible with more external devices, providing an inverted S.Port output and supporting the use with other receivers. In addition, it has solder points to connect 4 PWM channels.


FrSky R9 MX.

The improved design proves to be more robust, compact, and durable and, together with synchronization with the latest ACCESS firmware, can be used to the true potential of ACCESS. The frequency varies between 868 ~ 915Mhz. Its dimension is 18 x 12 x 3.2mm and its weight is only 3.2g. The operating voltage is 3.5V ~ 10V and the operating current is 100mA at 5V. The R9 MX also supports OTA functions.

The MX differential for other FrSky receivers, in the SX and Stab line, is in the inverted S.Port output, signal redundancy, and super low latency. The range of control and telemetry can reach an impressive 10 km. The compatibility of the MX is confirmed with the receivers R9M Lite, R9M Lite Pro, and R9M 2019 with the firmware ACCESS. This receiver can be obtained together with the R9M module or individually at horusrc.com!

Final Considerations


Investment in these products is recommended. The combined use of the FrSky 900MHz R9M 2019 transmitter module with the FrSky R9 MX receiver will provide a safe, long-range flight and will bring an upgrade to your drone. The installation does not require any secrets and its use is very intuitive. These products stand out among others found on the market.

Quality technology, very well-developed features, and fail-safe are some of the benefits found in the FrSky 900MHz R9M 2019 transmitter module combo with the FrSky R9 MX receiver. If your goal is to build a 900 MHz drone for large ranges, these two items cannot be missing. FrSky is a brand of extreme quality and trust and its products can be found at horusrc.com!

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  • Agree with Edward Sellars below. Frequency is lower for longer range.

    These posts appear to be quite blatant advertising: "Investment in these products is recommended"
  • The lower the frequency, the further it can go. Not the higher the frequency.

    Also, the R9 is a solid unit but I wouldn’t say it is the BEST. The RFD900x units operate at the same frequency with ppm control but also get full autopilot telemetry as well as AES hardware encryption and range is 30-50km with fcc certification (required for BVLOS use. Not sure if the R9 is fcc certified but if I suspect it is). So I like the R9 but it’s not the best unit. I really like the Dragonlink units (even more robust since they operate at 433mhz) and can penetrate even further. They also do RC control and telemetry but telemetry is an annoyance to make work on those (But it does) and it doesn’t have fcc certification or encryption.

    I have used all many many times so just my 2 cents but should be quite objective since I have ties to none.
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