RadioMaster RP4TD-M ExpressLRS 2.4GHz Mini True Diversity Receiver, TCXO, Dual SX1281, CRSF
RadioMaster RP4TD-M ExpressLRS 2.4GHz Mini True Diversity Receiver, TCXO, Dual SX1281, CRSF
RadioMaster
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Overview
The RadioMaster RP4TD-M ExpressLRS 2.4GHz Mini True Diversity Receiver is a compact, lightweight receiver designed for builds where space and weight are critical. It uses dual-channel 2.4GHz radios with Gemini true diversity to help mitigate interference, and includes a built-in TCXO for stable frequency control. Weight is 1.00g (without antennas) / 3.30g (with antennas).
Key Features
- Mini size true diversity Gemini receiver
- Class leading SNR and RSSI performance
- Built-in TCXO (temperature compensated crystal oscillator)
- Optimized PCB design for better heat dissipation
- Dual SX1281 transceivers (SX1281 x 2)
- Upgraded rigid dual-antenna design for greater durability and performance
- Telemetry RF power output: max 2 x 10mW
- Compatible with all 2.4GHz ExpressLRS modules and transmitters with built-in 2.4GHz ExpressLRS
Specifications
| Item | RP4TD-M ExpressLRS 2.4GHz Diversity Receiver |
| Type | ISM |
| MCU | ESP32 |
| RF Chip | SX1281 x 2 |
| Antenna | 65mm 2.4GHz T Antenna x 2 |
| Frequency Range | 2.4GHz |
| Maximum Refresh Rate | 500Hz / F1000Hz |
| Telemetry RF Power | Max 2 x 10mW |
| Working Voltage | DC 5.0V |
| WiFi Updates | Yes |
| Weight | 1.00g (without antennas) / 3.30g (with antennas) |
| Dimensions | 18.10 x 16.00mm |
| Thickness | 2.00mm |
| Firmware Version | ExpressLRS V3.4.3 pre-installed |
| FW Target | RadioMaster RP4TD-M 2400 RX |
| Bus Interface | CRSF |
| Antenna dimension markings | 79.00mm and 65.00mm (as labeled) |
TCXO (temperature compensated crystal oscillator)
The TCXO ensures high stability and accuracy in frequency control, compensating for temperature variations. This helps maintain consistent and reliable signal reception and reduces frequency drift over time. More technical background is available here: https://www.expresslrs.org/hardware/crystal-frequency-error/.
What’s Included
- 1 x RP4TD-M ExpressLRS True 2.4GHz Diversity Receiver
- 1 x CRSF wire
- 3 x Heat-shrinkable tube
- 2 x 65mm 2.4GHz T antenna (installed on receiver)
- 1 x User manual
For wiring or compatibility questions (CRSF, ExpressLRS versions, or firmware target selection), contact support@rcdrone.top or visit https://rcdrone.top/.
Applications
- Lightweight FPV drones and racing builds
- RC aircraft and multirotors using ExpressLRS 2.4GHz with CRSF
- Robotics and RC projects that require a compact ExpressLRS receiver
Related Products
- RP1 ELRS Nano Receiver
- RP2 ELRS Nano Receiver
- RP3 ELRS Nano Receiver
- RP4TD ELRS Diversity Receiver
Details
Built for tight FPV builds, the RP4TD-M pairs Gemini true diversity reception with a compact footprint and stable TCXO timing.
A built-in TCXO helps keep frequency control stable across temperature changes for more consistent link performance.
Dual SX1281 radios support true diversity operation to help mitigate interference in challenging RF environments.
The upgraded rigid T antennas are made for durable dual-antenna routing on lightweight frames.
Smaller and lighter than the RP4TD, the RP4TD-M is a better fit for racing and ultralight builds.
Key specs at a glance: ESP32 + dual SX1281, CRSF bus, 5.0V input, and up to 500Hz / F1000Hz refresh rates.
At just 1.00g without antennas, the receiver keeps overall AUW down on micro and racing builds.
Exact dimensions (18.10 × 16.00 × 2.00mm) and antenna length markings help plan mounting and antenna placement.
