The XR Adds Two Radios and 3.5g: Nexus-X or Nexus-XR?
Quick Answer
Choose the RadioMaster Nexus-XR if you want 2.4GHz ExpressLRS built into your Rotorflight controller. Choose the Nexus-X if you already own a suitable receiver or want to choose the radio link yourself. The XR adds true diversity, two antennas and 3.5g; it does not add a faster flight-controller processor.
What the XR Actually Adds
The names make this look like a processor upgrade. It is not. Our current RadioMaster Nexus-X and RadioMaster Nexus-XR listings both specify an STM32F722RET6, ICM42688P motion sensor, SPL06-001 barometer, 256MB blackbox flash and five UARTs.
The meaningful change is inside the XR's aluminium case: an RP4TD-M 2.4GHz ExpressLRS receiver with two SX1281 radios and two 65mm antennas. It connects internally over CRSF, supports Wi-Fi updates and removes the separate receiver box and cable from the installation. RadioMaster specifies up to 500Hz or F1000 refresh modes and a maximum telemetry output of 2 × 10mW.
| Specification | Nexus-X | Nexus-XR |
|---|---|---|
| Processor and IMU | STM32F722, ICM42688P | STM32F722, ICM42688P |
| Receiver | External, protocol of your choice | Integrated RP4TD-M ELRS 2.4GHz |
| Dimensions | 44.7 × 26.5 × 12.3mm | 44.7 × 26.5 × 14.3mm |
| Manufacturer-listed mass | 20.6g | 24.1g |
| Blackbox and UARTs | 256MB, five | 256MB, five |
The Wiring Decision Matters More Than 3.5g
Both controllers accept a 5–16V supply, provide four servo outputs for S1, S2, S3 and tail, support servos up to 12V, and expose an external voltage-sensing input rated from 3.6V to 70V. That last figure is a telemetry measurement range, not permission to power the controller from a 70V pack. Both belong in our flight controllers and electronics collection.
The Nexus-X remains the better buy when a helicopter already has a trusted receiver, when you need a non-ELRS protocol, or when receiver placement demands more freedom. RadioMaster provides a locking connector for its RP3-H ELRS receiver, but the receiver is separate. Our ELRS receiver selection article explains why antenna layout can matter as much as the receiver name.
What We Would Buy
For a new 2.4GHz ELRS helicopter, we would buy the Nexus-XR. A 3.5g penalty is a fair trade for fewer plugs, one fewer loose module and factory-defined CRSF integration. We would not replace a working Nexus-X merely to hide an external receiver; the flight-control core is effectively the same.
Before installation, read our Nexus-X Rotorflight setup article, then follow the current RadioMaster pinout for the exact board in hand. Keep both XR antennas clear of carbon, metal and each other, and remove blades before checking servo direction, collective movement or failsafe behaviour.
FAQ
Q: Is the Nexus-XR faster than the Nexus-X?
A: No. Both use the same STM32F722 processor and ICM42688P sensor. The XR upgrade is primarily its integrated true-diversity ELRS receiver.
Q: Can the Nexus-XR use a different receiver?
A: Yes. Its listed receiver support includes CRSF, ELRS, Ghost, S.BUS and other serial protocols through the available ports, although buying the XR makes most sense when using its internal ELRS receiver.
Q: Does 70V mean I can power either unit from 16S?
A: No. RadioMaster lists 5–16V for controller power. The 3.6–70V figure belongs to the separate external voltage-telemetry input.