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RadioMaster R81 Receiver

Communication & Data Links
by Holybro

Description

The RadioMaster R81 is a compact 2.4GHz nano receiver compatible with RadioMaster Multiprotocol (4in1) or CC2500 radio controllers. It features 8 channels with SBUS output, RSSI signal strength monitoring, and fail-safe protection. Designed for small unmanned aerial systems, it offers over 1km control range and is specifically configured for use with Pixhawk 6X, 6C, Mini, and Pix32 V6 flight controllers via pre-soldered Dupont connectors.

About the Company

Holybro

Holybro is a manufacturer of drone components and systems, specializing in flight controllers, GPS modules, FPV products, and drone development kits for unmanned aerial vehicles.

Core Information

Serving industries
Air
Name
RadioMaster R81 Receiver
Model number / Variant
R81
Product status
In Production

Product Classification

Link roles
Command & Control (C2)
System type
RF Radio Transceiver
Supported platform classes
sUAS
Operating environment
Airborne
Link topology
Point-to-Point
LOS/BLOS capability
LOS
Duplexing modes
Half‑Duplex

Frequency & Spectrum

Frequency bands
2.4 GHz ISM
Spectrum licensing
Unlicensed/ISM

Data & Performance

Range conditions
Line-of-sight conditions
Maximum range (km)
1

Interfaces & Protocols

Physical interfaces
Serial UART
Control/Telemetry protocols
MAVLink

Security

Authentication methods
Pre‑Shared Key (PSK)
Key management
Pre‑Shared

Power & Physical

Power options
DC
Mounting options
Airframe/Internal
Dimensions (mm)
17 x 11 mm
Input voltage range (V)
4.5-6V
Weight (g)
2

Software & Management

Telemetry/Integration
MAVLink

Compatibility & Integration

Autopilot compatibility
ArduPilot PX4
GCS compatibility
QGroundControl Mission Planner
Interoperability standards
ASTM F3411
Integration notes
Compatible with Pixhawk 6X, 6C, Mini, and Pix32 V6 flight controllers. Ships with pre-soldered Dupont connector. Not compatible with ELRS version controllers.