BetaFPV ELRS Micro TX module has output power up to 500mW.??OLED screen and navigation button makes possible to change the ExpressLRS settings without the OpenTX Lua script, enabling the support for the radios that don’t run on OpenTX firmware (Futaba, Radiolink, etc).
There is USB Type-C connector for firmware updates and XT30 connector for external power support.
BetaFPV ELRS Micro TX module has cooling fan that turns on automatically according to the output power level (start from 250mW) and? multicolor LED light to ad fancy lighting for on your module.
Oh, and BetaFPV states that this module has “An Arc Reactor to provide the highest performance…”?
Available in 2.4GHz, 868MHz and 915MHz options @
BetaFPV:?https://betafpv.com/products/elrs-micro-tx-module
Specifications
Packet refresh rate: 25Hz/50Hz/100Hz/200Hz (915MHz/868MHz), 50Hz/150Hz/250Hz/500Hz (2.4GHz)
RF output power: 25mW/50mW/100mW/250mW/500mW (2.4GHz), 100mW/250mW/500mW (915MHz/868MHz)
Frequency bands (Micro RF Module 2.4G version): 2.4GHz ISM
Frequency bands (Micro RF Module 915MHz/868MHz version): 915MHz FCC/868MHz EU
Input voltage: 5V~12V
XT30 port: 5V~12V, recommend 2S(8.4V) battery, DO NOT support 3S(12.6V) or above
USB port: Type-C
ExpressLRS?offers the best possible link performance for both latency and range. This is achieved with an optimized over the air packet structure. Thanks to this,?ExpressLRS?achieves?better latency AND range?compared to other options in the market. For example, on 900MHz band,?ExpressLRS with 200Hz?will definitely out-range?Crossfire 150Hz?and?ExpressLRS 50Hz?will out-range?Crossfire 50Hz?in watt per watt max range comparison.?ExpressLRS supports full telemetry (VBAT, downlink/uplink?LQ?and downlink/uplink?RSSI?are transmitted always and full telemetry can be enabled in the configurator).
Total link latency comparison (image from ExpressLRS Wiki)
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ExpressLRS?is based on the?Semtech?SX127x/SX1280?LoRa?hardware combined with an?ESP8285,?ESP32?or?STM32.?ExpressLRS?supports a wide range of DIY hardware platforms, also?FrSky R9?system.
Happymodel? has released official?ExpressLRS?TX and RX modules for 900MHz and 2.4GHz frequency options.
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Banggood: 2.4GHz –?https://www.banggood.com/Happymodel-ES24TX-2_4GHz-ExpressLRS-TX-Module
900MHz –?https://www.banggood.com/Happymodel-ExpressLRS-ES900TX-915MHz-Ultra-Long-Range-Transmitter-Module
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Banggood: 2.4 GHz –?https://www.banggood.com/0_42g-Happymodel-2_4G-ExpressLRS-EP1-Nano-High-Refresh-Rate-Ultra-small-Long-Range-RC-Receiver
The pinout of the Happymodel ExpressLRS PP, EP1 and EP2 receivers:
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? BetaFPV:?https://betafpv.com/collections/expresslrs-series/products/elrs-nano-tx-module
? Banggood: 2.4GHz –?https://www.banggood.com/BETAFPV-ExpressLRS-2_4GHz-Nano-Long-Range-Micro-TX-Module
? 900MHz –?https://www.banggood.com/BETAFPV-ExpressLRS-868-or-915MHz-Nano-Long-Range-Micro-TX-Module
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? BetaFPV:?https://betafpv.com/collections/expresslrs-series/products/elrs-nano-receiver
? Banggood:?2.4GHz –?https://www.banggood.com/0_7g-BETAFPV-ExpressLRS-2_4GHz-Nano-Ultra-small-Long-Range-RC-Receiver
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? Flywoo: https://flywoo.net/collections/new/products/0-4g-flywoo-2-4g-expresslrs-elrs-el24e-el24p
? Banggood:?https://www.banggood.com/0_4g-Flywoo-Universal-ExpressLRS-ELRS-EL24E-or-EL24P-…-1887378.html
ExpressLRS can also be flashed to ImmersionRC Ghost TX and?Atto / Zepto receivers.
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The complete list of the available ExpressLRS hardware can be found here:?List of ExpressLRS hardware – Transmitters and Receivers
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Which ExpressLRS system is better? 900MHz or 2.4GHz band? It depends on what is your target use. If you fly quadcopters and not worried about reaching the tens of the kilometers of the long range, then 2.4GHz is recommended. Advantages of the 2.4GHz:
However 900MHz band ExpressLRS can penetrate more obstacles and can get your aircraft father than 2.4GHz.
There is a leaderboard of the max distances traveled with ExpressLRS hardware here:
https://github.com/ExpressLRS/ExpressLRS/wiki/Range-Competition
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ExpressLRS uses the?CRSF serial protocol to communicate between the radio transmitter and the ELRS TX module. In order to set CRSF protocol,? go to your selected model settings, in the “Model Setup” tab, enable your “External RF” and select “CRSF” as the protocol:
Internal RF module should be turned OFF.
OpenTX has ADC filtering turned on by default. This means that sticks position values are averaged or so called “smoothed” on the radio, but as the result you could get the rough values that are “jagged”. So if you are flying the quads and not the fixed wings with servos, then it is recommended to turn the ADC filter OFF. You can find this setting on hardware setup page in the SYS settings by long pressing the SYS button.
On monochrome LCD radios:
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All the TX module parameters and configuration changes can be made with the help of the LUA script.
Download LUA file from this link:?ExpressLRS Lua Script?(right click on the link and select “Save file as…”).?Alternatively you can download the latest LUA script from the ExpressLRS Configurator.
Copy LUA Script file?ELRS.lua?to the folder \SCRIPTS\TOOLS\ on the radio SD card.
You can run the ExpressLRS LUA configurator by long pressing the SYS button and selecting the ELRS Lua script from the list.
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Once the ERLS LUA script is working you’ll see the configuration options.
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The ERLS.Lua script top bar shows the bad packet count and the current working packet rate. It should always show a stable 0:[user selected packet rate]. For example: 0:50, 0:150, 0:250, 0:500. If the packet rate shows 0:250 no matter what Pkt. Rate setting is, then your?crsfshot is not working properly.
If the LUA script shows only the “Connecting…” message on the screen, it means the LUA is not communicating with the ExpressLRS TX module.
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Possible reasons and solutions to this issue:
If??the LUA script shows !!! VERSION MISMATCH !!! error warning, this means you need to update the TX module firmware.
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As of writing this article the ExpressLRS?was still in the beta phase. The stable version?1.0?was just released, so you are advised to update to it. Also every new version has some bugs or features fixed. It is strongly recommended to update the freshly purchased ExpressLRS hardware (just to mention a few – Happymodel ES24TX, ES915TX, Namimno Flash & Voyager, BetaFPV ELRS Nano TX and RX transmitter modules and receivers). Usually the purchased TX modules and receivers does not contain the latest firmware.
Unfortunately there is no way how to find out what firmware version is on your TX/RX currently. You have to update all the modules to the latest known firmware to be sure you have the same and the latest firmware on TX/RX. This will be improved in the ExpressLRS version 1.1 in the nearest future.
There are several methods to flash the ExpressLRS firmware into TX or RX modules. These depend on the hardware you use ant its capabilities (does it have USB socket, does it have WiFi ESP32 chip, etc).
For TX module available methods are TX update, WiFi update,?UART update.
For RX modules?available methods are BF serial passthrough, WiFi update, UART update.
In general: if your TX or RX has ESP chip on board then WiFi update is available. If your TX module has USB socket, then UART update method is available. Any RX can be updated by BF serial passthrough or UART update method.
The list of possible firmware flashing methods for each of the hardware item can be found here:?https://github.com/ExpressLRS/ExpressLRS/wiki/Flashing-ExpressLRS
In order to flash TX or RX module you need to prepare (compile) the firmware.
Download and install?ExpressLRS Configurator. You can download the?ExpressLRS Configurator from here:? https://github.com/ExpressLRS/ExpressLRS-Configurator/releases
Start ExpressLRS Configurator and choose the firmware release. “RC-x” addon to release number means this is Release Candidate version. You should use RC versions if you really need to. If you are not sure, then choose the stable versions like “1.0.1” and up.
The following instructions are made for updating the Happymodel ES24TX radio transmitter modules and the EP1/EP2 receivers. Instructions are similar for the other ExpressLRS TX and RX modules on the market.
Select your hardware and update type you are building the firmware for. Usually firmware target name ending ( “_WiFi“, _UART“, _BetaflightPassthrough) mean the corresponding different methods of firmware update. You should choose the firmware option with the update method you are going to use UART,?Wifi?or BetaflightPassthrough.
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After the device is selected you will have to set the Device options specific to the selected hardware.
Device options
USE_500HZ? – Enables the 500Hz update speed (this option is removed in the later versions)
HYBRID_SWITCHES_8 – Enables the use of the three-way and 6-way switches (by default the ExpressLRS transmits only two-way (On-Off) switches in the channel data).
ENABLE_TELEMETRY – Enables additional telemetry like Battery voltage, Current, GPS data, Flight mode (the basic telemetry like RSSI, Link Quality is transmitted always)
After everything is set up, press the BUILD button. Once compiling is finished, the Configurator will open the fomder with the compiled firmware.bin file.
Updating via WiFi is probably the most convenient way of firmware flashing/updating.
First you have to put the TX into WiFi update mode. Go to the ELRS Lua script on your transmitter by long pressing the
Then connect to the WiFi network called “ExpressLRS TX Module“. The WiFi network password is “expresslrs” Don’t get confused with the “ESP WiFiManager” WiFi network – this is the backpack ESP chip making its hotspot network and currently (as of firmware version 1.0) is not used. Read more about this backpack network below in the notes.
Once you have connected to the ExpressLRS TX Module WiFi network, start your internet browser and open this address: http://10.0.0.1
You’ll see the ExpressLRS WiFi update page welcome screen.
Scroll down the page, select the the compiled firmware file?firmware.bin? (read about preparing and compiling the firmware up in the article) by pressing the “Choose file” button. Hit the “Update” button to start the update process.
Wait until the webpage refreshes and the address changes to http://10.0.0.1/update. The page might look like that:
Important! Don’t hurry, wait at least another 10 seconds for the update to finalize.
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If you have select the firmware target version with “_via_UART“, then you can press the [BUILD & FLASH] button to build and flash the ExpressLRS? module in one step. Your transmitter module should be connected to the PC via USB cable before this step.
ExpressLRS configurator will compile first, then automatically will detect the serial port where the ExpressLRS TX module is connected and will try to flash the compiled firmware into it.
If building and flashing is successful then you should see following result.
If the ExpressLRS Configurator fails to detect the TX module then you’ll see this kind of error.
In this case you will have to select the serial port?of your manually.
Select your receiver hardware and update type you are building the firmware for. Usually firmware target name ending ( “_WiFi“, _UART“, _BetaflightPassthrough) mean the corresponding different methods of firmware update.
After the device is selected you will have to set the Device options specific to the selected hardware.
Device options
USE_500HZ? – Enables the 500Hz update speed (this option is removed in the later versions)
HYBRID_SWITCHES_8 – Enables the use of the three-way and 6-way switches (by default the ExpressLRS transmits only two-way (On-Off) switches in the channel data).
ENABLE_TELEMETRY – Enables additional telemetry like Battery voltage, Current, GPS data, Flight mode (the basic telemetry like RSSI, Link Quality is transmitted always)
AUTO_WIFI_ON_INTERVAL – Enables automatic start of WiFi update on the startup. Timeout value can be customized (by default it is 40 seconds).
Updating the ExpressLRS receiver via WiFi is definitely the most convenient way of firmware flashing/updating.
First you have to put the RX into WiFi update mode. For this you need to power on the receiver without your radio. Receiver will enter into atomatic WiFi upade mode after the AUTO_WIFI_ON_INTERVAL timout
Then connect to the WiFi network called “ExpressLRS RX Module“. The WiFi network password is “expresslrs“.
Once you have connected to the ExpressLRS RX Module WiFi network, start your internet browser and open this address: http://10.0.0.1
You’ll see the ExpressLRS WiFi update page welcome screen.
Scroll down the page, select the the compiled firmware file?firmware.bin? (read about preparing and compiling the firmware up in the article) by pressing the “Choose file” button. Hit the “Update” button to start the update process.
Wait until the webpage refreshes and the address changes to http://10.0.0.1/update. The page might look like that:
Important! Don’t hurry, wait at least another 10 seconds for the update to finalize.
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If you have select the firmware target version with “_via_BetaflightPassthrought“, then you can press the [BUILD & FLASH] button to build and flash the ExpressLRS?receiver in one step. Your receiver should be connected to the flight controller and your flight controller should be connected to the PC via USB cable before this step.
ExpressLRS configurator will compile first, then automatically will detect the serial port where your flight controller is connected, will try set the controller into the Betaflight Passthrough mode and flash the compiled firmware into it.
If building and flashing is successful then you should see following result.
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You might get the “Not Enough Space” error while updating your ELRS receiver to 3.x version. This happens because the new firmware gets bigger and now the developers
One possible solution using WiFi update method is to to flash the version 2.5.1 of ExpressLRS firmware first and only then the 3.x version to your receiver
Second possible solution is to flash the version 3.x firmware with Betaflight SerialPassthrough or by using FTDI UART adapter.?
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The “Target mismatch” error message when updating to 3.1.x version happens because the new ELRS firmware is slightly larger with all the new features added and is now bigger than the free space in the flash. Luckily the ESP8285 MCU, used in the most of the receivers, allows uploading a gzipped firmware, so the developers will use this feature of flashing compressed firmware from the version 3.2 to solve this issue.
Update via WiFi stores the new firmware in the left-over space and on reboot it is installed (updated) in the device’s main flash memory.
Update via UART/Betaflight Passthrough overwrites the old firmware directly.
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ExpressLRS receivers can be bound in two ways – automatically when using the same bind phrase or in conventional way by putting both TX and RX into binding mode.
ExpressLRS receiver automatically binds to the transmitter module if both TX and RX modules have the firmware with the same bind phrase. You can set your custom binding phrase in the ExpressLRS Configurator.
You need to compile and update the firmware for both TX and RX with the same binding phrase. In this case you wouldn’t need to use the bind option on the the ELRS Lua script, the TX and RX should auto-bind.
Alternatively you can bind any ExpressLRS receiver to any ExpressLRS transmitter by setting both to bind mode. In order to set receiver into bind mode you have to power on and off cycle the receiver 3 times and it will enter into bind mode. Transmitter module can be set into the bind mode by selecting [Bind] option in the ERLS Lua script.
Some ExpressLRS transmitter modules have Bind button on the module and you can enter the bind mode by pressing that button.
ExpressLRS receivers use CRSF protocol to communicate with the flight controller. So the ExpressLRS receivers should be connected the same way as TBS Crossfire receivers. Any Crossfire receiver connection diagram is also valid for the ExpressLRS receiver. Moreover the ExpressLRS receivers have the same pinout as TBS Crossfire Nano receivers so they can be direct mounted (soldered) on the FC board or adapter boards as the TBS Crossfire Nano RX.
The general rule is to connect the ExpressLRS receiver TX pad to the Flight controller RX pad and RX pad to the TX pad. Also GND to GND and usually the ExpressLRS receivers are powered from 5V.
Open Betaflight Configurator, select the “Serial based receiver” and “CRSF” as protocol in Configuration tab.
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Always turn transmitter first then switch to your ExpressLRS model on the radio, only then power up the quad otherwise?you’ll probably get your ExpressLRS into the WiFi update mode, especially if Wifi Interval is set to 20s as default setting is (in the latest versions it was changed to 40s).
You can keep the your radio on between changing to different quads. You can also increase the WiFi interval to 40s or more in case you want to power the quad first and have a plenty of the time to power the radio transmitter afterwards.
When the option?HYBRID_SWITCHES_8?is switched on, then only the AUX1 channel is sent with every packet. . Other channels (AUX2–AUX8) are sent one channel per one packet and can take up to 7 packets for the channel value to be sent to the receiver. Using the AUX1 for arm ensures the disarm command to be sent to the model as quickly as possible. AUX1 is simply the lowest latency?AUX channel in ExpressLRS.
Note: if you don’t use?HYBRID_SWITCHES_8 , then you can use any channel for ARM/DISARM as all the channel AUX1-AUX8 values are sent with every packet. All the channels are only the 2-pos (ON-OFF).
Happymodel?ES24TX module has backpack ESP32 chip on the board.??HappyModel should not have put any firmware on it before shipping, as there is no special firmware for it (at least for the FW version 1.0)
There is no way to turn it off easily, but you can wipe it with esptool.?Actually the influence of the additional WiFi network created by ESP backpack is not significant, so no need to worry about it.
CRSFShot is what ExpressLRS uses to be fast. CRSFShot reduces the latency up to 25% and also reduces the variable latency by 95%.
Actually you may find CRSFShot called differently, mostly depending on “who you talk to or which “release notes” you read”. OpenTX calles it “Sync Pulses” and it is supported from the OpenTX version 2.3.12. CRSFShot is also known as “Mixersync”.
Enabling ENABLE_TELEMETRY option in the ExpressLRS Configurator adds?support?for the Betaflight?lua script.
Any ExpressLRS receiver will work with any ExpressLRS transmitter. You just need to make sure they are on the same frequency range (900MHz or 2.4GHz) and have the same firmware version.
If you set the higher power output than (500mW, 1W or 2W) and the script reverts it to the 250mW it means the transmitter module is not capable of the higher power levels.
If you get “Telemetry lost” warnings, while your dBm/Link quality is still good it means your telemetry rate is too low. Try increasing it until “Telemetry lost” warnings disappear.
If the receiver does not connect to the radio and the?AUTO_WIFI_ON_INTERVAL is set on then the receiver enters into WiFi mode and starts to heat up. It is recommended to power the receiver AFTER the radio is powered on even if you are starting it on the bench. In this case the receiver starts in normal mode and stays in it until power cycled again.
If you have to plug in the battery several times for the receiver to start properly and you get solid led light on the receiver it might be that flight controller pulls receivers RX line to the ground while powering on. Receiver then enters the bootloader mode and does not start. This issue is present on some flight controllers and can be fixed by adding the 1kOm pullup resistor?from RX line on receiver (TX pin on the FC) to the 3.3V on the FC.
On some flight controllers this issue is present only on some of the UARTs, so its recommended to try another UART if you experience this issue.
List of FC’s that are known to have this issue: GEPRC GEP-F4-35A-AIO,?GEP-20A-F4, GEP-12A-F4, iFlight Succex-D AIO f4, Mamba F405, …
It seems that some Happymodel EP1 and EP2 have issue of not booting and getting extremely hot, even overheating. The symptoms are – receiver lights solid LED for a moment upon startup and then LED stays in the dimmed state. Receiver gets locked up, consumes a lot of current and heats up. Cause is unknown, there is a presumption that voltage regulator is the culprit. In the most cases the voltage regulator has markings SDG on the chip.
Parts of the the article are used from: ExpressLRS GitHub, Discord and etc.
OpenTX 2.3.12 was released a few weeks ago and shortly afterwards 2.3.13 followed. There are a lot of fixes and improvements in this version, but the most interesting is Synced pulses (also known as CRSF Shot). This version includes synchronization between the mixer and the data sent to module that has been successfully tested for several month in TBS and ImmersionRC specific builds. OpenTX version 2.3.12-13 is also the version that supports Jumper T-Lite and Radiomaster T8 Pro radios.
How to update the firmware of the OpenTX radio: Guide: How to update OpenTX firmware
TBS has released the “full size compact” radio called Mambo. This was expected to be released as some info was leaked earlier (see new post Weekly news & new products: Week 38). Mambo radio transmitter comes in standard and Ethix special edition.
More about TBS Mambo radio is here: TBS Mambo radio with Tracer inside
AxisFlying release 2.5inch sized AirForce PRO X8 octocopter. It has 8 (octo!) pieces 1404 size 4510KV brushless motors, Matek System F722 Mini SE Flight Controller, AxisFlying 30A 4in1 ESC, Runcam Nano 2 FPV Camera and 600mW VTX or Caddx Vista Nebula Nano HD FPV system.
It is the first 2.5inch X shaped octocopter. It is capable of carrying full size GoPro for areal video shooting.
Air Force PRO X8 comes in analog and digital FPV versions.
Available @:
Banggood: https://www.banggood.com/search/axlsflying-airforce-pro-x8.html
AxisFlying: https://www.axisflying.com/?s=AirForce+PRO-X8
NeutronRC has announced their ExpressLRS 900MHz receiver. Receiver size is only 10x18mm size. Unavailable yet.
Happymodel discontinued ES915TX and released new ES900TX 915(868)MHz transmitter module. Now it comes with JR box and the cooling fan. Also the main STM32 chip was replaced with the ESP32 chip and backpack ESP8285 WiFi chip was added.
Also Happymodel discontinued ES915RX and released new ES900RX receiver. New receiver is smaller, lighter and now it can be updated via WiFi (because STM32 chip was replaced by ESP32 chip).
All the differences between old and new transmitters and receivers can be found in this table.
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DarwinFPV also released the 3 inch 1S FPV quadcopter. It looks very much like HGLRC Rekon 3 quadcopter, only the frame is printed from nylon. Probably “inspired” by Rekon 3. DarwinFPV 3inch 1S quadcopter weights 58 grams and is lighter than Rekon 3 that weights 63 grams. 3 inch props are spun by 1103 12000KV motors.
Available @ Aliexpress (-6$USD coupon “I23MIS9P7RMC”): https://s.click.aliexpress.com/e/_9INl8o
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FETtec released new 2004 size and 2104 size motors. Both motors comes with 1800KV ratings and are clearly made for 6S operation.
FETtec Motor FM2104M
Specification sheet: https://fettec.net/media/pdf/85/8c/19/FM2104M-1800.pdf
Available @ FETtec: https://fettec.net/shop/fettec-motor-fm2104m-1800kv-wahlweise-quadmovr-edition
FETtec Motor FM2004T
Specification sheet: https://fettec.net/media/pdf/1b/b9/2e/FETTEC-2004-1800KV.pdf
Available @ FETtec: https://fettec.net/shop/fettec-motor-fm2004t-1800kv
LDARC (aka as KingKong) release entry level radio transmitter EX8. It supports Futaba, Frsky D16 EU/LBT and FCC protocols.
Available @ https://shop.makerfire.com/collections/new-arrival/products/ldarc-kingkong-ex8-8ch-radio-controller
Source: Facebook, Instagram
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ExpressLRS is the Open Source Long Range radio control system, developed by Alessandro Carcione (aka AlessandroAU). ExpressLRS offers the best possible link performance for both latency and range. This is achieved with an optimized over the air packet structure. However, only basic telemetry is currently provided (VBAT, downlink/uplink LQ and downlink/uplink RSSI), work is underway for full telemetry support. Thanks to this, ExpressLRS achieves better latency AND range compared to other options in the market. For example, ExpressLRS 900MHz 200Hz will dramatically out-range Crossfire 150Hz and ExpressLRS 50Hz will out-range Crossfire 50Hz watt per watt.
ExpressLRS is based on the Semtech SX127x/SX1280 LoRa hardware combined with an ESP8285, ESP32 or STM32. ExpressLRS supports a wide range of DIY hardware platforms, also FrSky R9 system, but there was no dedicated hardware so far. Now we have first of the shelf ExpressLRS TX and RX modules.
There is massive heatsink on the ES915TX PCB to dissipate the heat on high power output levels (TX module is capable of outputting up to 2W!).
One downside of the TX module is it comes without the JR case. You still need to buy or 3D print the JR case and do some DIY to install it.
ES915TX transmitter module comes with the SMA pigtail and the T shape antenna.
ES915RX receiver module comes with the T-shape antenna too.
Receiver weights only 0.7 grams.
Happymodel ExpressLRS ES915TX and ES915RX is the cheapest LoRa Long Range system currently on the market! It is great to have the cheaper alternatives to the well knows systems as TBS Crossfire and ImmersionRC Ghost.
Release date: March, 2021
Price: ~ $49.99
More details on the project can be found here: https://github.com/AlessandroAU/ExpressLRS
Available @
Banggood: https://www.banggood.com/Happymodel-ExpressLRS-ES915TX-915MHz-Ultra-Long-Range-p-1814915.html
Specifications:
ES915TX Transmitter：
Dimension: 55mm*39mm*13mm(include heat sink)
Weight: 23gram (exclude antenna)
Antenna connector: SMA
VCC input: 5~13v, Recommend 5v~9v
RF Frequency Range: 902MHz ~ 928MHz
Maximum Output Power: <33dBm(For >27dBm operation, we recommend add a fan for force cooling)
ES915RX Receiver：
VCC input: 3.7~24v Recommend 5v~12v
Operation current: ~100Ma
Rx To FC protocol: CSRF
RF Frequency Range: 902MHz ~ 928MHz
Dimension: 16mm*10mm*3mm
Weight: 0.70 gram (exclude antenna)
Antenna connector: IPEX4
Telemetry output Power: <17dBm
Info source: gitHub, Happymodel.cn
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The R9 MX is upgraded version of R9 Mini and R9 MM, takes features from the previous receivers and making it compatible with more external devices by providing an Inverted S.Port output and supporting the redundancy function. Additionally, it has soldering points to connect 4 PWM channels. R9 MX has OTA (Over the Air) firmware update capability.
The new R9 MX works only with the ACCESS compatible radios and R9M modules only (R9M 2019, R9M Lite, R9M Lite Pro).
The R9 SX is the enhanced version of the R9 Slim series of long-range capable receivers. It adds 3-pin servo connectors with 6 full PWM channels and utilizes the dual-antenna design. The light-weight protective shell has a Multi-use 6-pin plug to bring you additional functions like signal redundancy, telemetry feedback, external battery detection and more.
R9 SX has OTA (Over the Air) firmware update capability.
The 6 PWM channels can be converted to 4 PWM channels with the additional Ch5 and Ch6 can be configured as an alternative S.Port and SBUS outputs to the 6-pin port.
The new R9 SX works only with the ACCESS compatible radios and R9M modules only (R9M 2019, R9M Lite, R9M Lite Pro).
Available @
Not available yet.
| MX | SX | Stab | |
| 915MHz/868MHz | √ | √ | √ |
| Size (L*W*H) (including case and pins)* |
18*12*3.2mm | 36*17*7mm / 47.5*20.5*11mm* | 45.7*26.3*16.2mm* |
| Weight (including case and pins)* |
3.2g | 8.8g / 13g* | 18.6g* |
| SBUS Out Channel | 16 | 16 | 16 |
| PWM Out Channel | 4 | 6 | 8 |
| SBUS In | √ | √ | – |
| Operating Current | 100mA@5V | 100mA@5V | 140mA@7.4V |
| Voltage Range | DC 3.5V~10V | DC 3.5V~12.6V | DC 3.5V~10V |
| Over The Air (OTA) | √ | √ | √ |
| S.Port / F.Port | √ | √ | √ |
| Inverted S.Port | √ | ||
| External Ain Port | √ | ||
| Protocol | ACCESS | ACCESS / ACCST | |
| Compatibility | R9MLite/R9MLitePro/R9M 2019 | All | |
| Control Range & Telemetry | Up to 10Km or above | Up to 10Km or above | Up to 10Km or above |
| Features | Inverted S.Port | Switchable CH5/CH6 PWM channel (S.Port/SBUS Out) | Built-in 3-axis gyroscope and 3-axis accelerometer |
| Signal redundancy | Signal redundancy | Multiple configuration modes and methods (LUA & Freelink) | |
1. New Antennas for 900MHz RC System
● FrSky Super 8 Antenna for R9M / R9M Lite Module
Available @ https://www.horusrc.com/en/frsky-900mhz-super-8-antenna-for-r9m-r9m-lite-module.html
● FrSky Ipex1 T Antenna for R9 Slim / R9 Slim+ Receiver
Availabe @ https://www.horusrc.com/en/frsky-900mhz-ipex1-dipole-t-antenna-for-r9-slim-r9-slim-receiver.html
● FrSky Ipex4 T Antenna for R9 Mini / R9 MM Receiver
Available @ https://www.horusrc.com/en/frsky-900mhz-ipex4-dipole-t-antenna-for-r9-mini-r9-mm-receiver.html
● FrSky MMCX T Antenna for R9 Receiver
Available @ https://www.horusrc.com/en/frsky-900mhz-mmcx-dipole-t-antenna-for-r9-receiver.html
2. FrSky R9 Stab receiver main features
3. FrSky R9MM mini Long Range receiver
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 plus an inverted S.Port output, that makes it compatible with more devices, like F4 flight controllers that does not have inversion possibility.
Available @ https://www.horusrc.com/en/frsky-r9-mm.html
4. 900MHz Flex Firmware
R9M Working Frequency Band 915 – 928MHz / 860 – 873MHz
R9M Lite Working Frequency Band 915 – 928MHz / 860 – 873MHz
Download links: https://www.frsky-rc.com/?s=Flex%20firmware
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