Over two years in the past, BetaFPV launched their Nano TX ExpressLRS module to the world, they usually’ve simply launched the second technology, boasting vital enhancements over the unique. Does the BetaFPV Nano TX V2 ELRS module stand as much as the hype, and the way it compares to different nano-sized ExpressLRS modules? Let’s discover out on this overview.
Study extra about radio transmitters in FPV: https://oscarliang.com/radio-transmitter/
Study extra about ExpressLRS right here: https://oscarliang.com/setup-expresslrs-2-4ghz/
The place to Purchase?
You should purchase the BetaFPV Nano TX V2 module from:
The BetaFPV Nano TX V2 is available in three frequency choices: 2.4GHz, 868MHz, and 915MHz. My overview focuses on the two.4GHz model, as it’s my frequency of alternative for the management hyperlink.
Specs and Options
- Antenna Connector: RP-SMA (2.4GHz), SMA (915/868MHz)
- RF Energy (2.4GHz): As much as 1W
- RF Energy (915/868MHz): As much as 2W
- Packet Charge (2.4GHz): As much as 1000Hz
- Packet Charge (915/868MHz): As much as 200Hz
- Frequency Band: 2.4GHz ISM, 915MHz FCC, 868MHz EU
- Enter Voltage: 7V~13V DC
- Energy Consumption: Varies by frequency and energy
- USB Port: Kind-C
- Fan Voltage: 5V
- Default Firmware: ExpressLRS V3.3.0
- Weight: 28g
The Nano TX V2 options an built-in TCXO (Temperature-compensated crystal oscillator) to attenuate frequency deviation because of temperature variations for secure efficiency, and in addition deal with higher with sign interference with different gadgets such because the VTX.
The V2 module helps ExpressLRS Backpack, which implies you might configure it to do cool stuff like altering your analog goggle’s channel utilizing your radio.
Right here’s a comparative overview between the brand new Nano TX V2 and the earlier model.
| Nano TX V2 | Nano TX V1 | |
| Max RF Energy | 1W (2.4GHz) 2W (915/868MHz) | 500mW |
| RF Chip | SX128X/SX1276 | SX128X/SX1276 |
| Antenna T-LED | Supported | Unsupported |
| Cooling Fan | Sure | No |
| ELRS Backpack | Supported | Unsupported |
| Exterior Energy Provide | Supported (7-13V) | Unsupported |
Nearer Look
The Nano TX V2 maintains an identical aesthetic to its predecessor, that includes a white, injection-molded plastic shell and a light-weight construct at simply 28 grams.
A USB Kind-C port beneath the module facilitates firmware updates and exterior energy connectivity.
For top RF energy calls for that sure older radios can not meet, an exterior energy supply (7-13V) may be linked utilizing the supplied USB-C to XT30 cable. My checks with the Radiomaster Boxer and Pocket confirmed that exterior energy isn’t wanted for working at 1W, although it’s additionally a helpful possibility for these experiencing battery voltage sag at excessive outputs.
The two.4GHz module makes use of an RP-SMA antenna connector, whereas the 868/915MHz variations are outfitted with SMA connectors.
Two customizable buttons on the module permit for simple entry to capabilities like Bind Mode, RF Energy adjustment, and VTX Settings modifications and so on.
With the elevated transmission energy, the Nano TX V2 features a built-in cooling fan, routinely activated at 250mW or greater by default. Though efficient in holding the module cool, the fan is noticeably loud, measured round 48dB from a meter away.
T-LED Antenna
The Nano TX V2 introduces a first-ever function: the “T-LED” antenna—a T antenna with an built-in LED gentle. It’s meant for pilots to visually monitor their sign throughout flight, with the LED flickering to point information transmission and reception. The flickering pace varies primarily based on the telemetry ratio and packet charge. The T-LED antenna affords a 2dBi achieve, and you might put customary (non-LED) antennas on the Nano TX V2 too.
Nonetheless, in my expertise, the practicality of the T-LED antenna is considerably restricted. Beneath daylight situations, I might hardly see the LED gentle, and at excessive packet charges, the speedy flickering makes it seem consistently lit, lowering its effectiveness as a sign indicator.
BetaFPV Nano TX V2 compatibility
The Nano TX V2 seamlessly matches into radios with “Lite” exterior module bays, just like the Radiomaster Pocket that I used.
For these with customary JR module bays (e.g., TX16S, Boxer, and Jumper T20S), an adapter is offered to accommodate the BetaFPV Nano TX V2 module, making certain broad compatibility throughout varied transmitter fashions.
Get the adapter right here:
Energy Consumption
Energy consumption of the module varies with the RF energy stage, rising considerably at 250mW and above, primarily as a result of cooling fan kicking in.
Right here’s a breakdown of the present draw and precise RF output measured with an ImmersionRC Powermeter V2 throughout completely different energy ranges:
| Energy Ranges | RF Energy | Present |
|---|---|---|
| 25mW | 26mW | 0.19A |
| 50mW | 58mW | 0.22A |
| 100mW | 106mW | 0.3A |
| 250mW | 290mW | 0.5A |
| 500mW | 533mW | 0.62A |
| 1000mW | 1230mW | 0.85A |
Output Energy Testing
Earlier than conducting the output energy testing, I up to date the Nano TX V2 to the newest ExpressLRS firmware model 3.3.2. When in comparison with the Radiomaster Ranger Nano module, the BetaFPV demonstrated superior RF output energy, initially exceeding 1.3W and stabilizing round 1.16W after 20 minutes of testing, showcasing its spectacular efficiency.
ExpressLRS Firmware Replace
Updating the ExpressLRS firmware on the Nano TX V2 is easy.
Merely join the module to your laptop by way of the USB-C port, use the ExpressLRS Configurator, choose the BetaFPV 2.4GHz Nano TX V2 because the gadget, select UART as the strategy, choose the suitable COM port, and provoke the firmware flashing course of.
Gemini Mode Assist?
The Nano TX V2 doesn’t help Gemini Mode.
For these on this function, I like to recommend trying out the SuperG module, which I’ve lately reviewed. Whereas extra pricey, the SuperG doesn’t essentially provide higher vary however does present improved redundancy and extra constant hyperlink high quality, particularly in interference-heavy environments. For pilots on a finances or these flying in areas with low RF noise, the Nano TX V2 stays a strong alternative.
Conclusion
For those who’re out there for an reasonably priced but high-performing ExpressLRS module, the BetaFPV Nano TX V2 stands out as a superb alternative. It delivers excellent output energy alongside well-designed options that improve the consumer expertise. As a Lite module, and with assistance from a JR to Nano module adapter, it’s basically suitable with radios of all sizes. My solely criticism could be the noisy cooling fan, though it proves efficient in sustaining the module’s temperature.
You should purchase the BetaFPV Nano TX V2 module from: