RadioMaster R81 8CH FrSky D8 Compatible Nano Receiver with SBUS

The RadioMaster R81 is an ultra-lightweight nano receiver tailored for micro FPV drones, whoops, and tight freestyle builds requiring SBUS output. Weighing a mere 2 grams, it delivers 8 channels of control via the 2.4GHz FrSky D8 protocol, making it a drop-in match for multi-protocol radios like the RadioMaster TX16S, Boxer, or Zorro.

Key features

• Ultralight 17x11mm footprint fits seamlessly into space-constrained micro frames.
• Native FrSky D8 protocol compatibility.
• Delivers an 8-channel SBUS signal to the flight controller.
• Injects RSSI data directly onto Channel 9 of the SBUS stream for easy OSD monitoring.
• Provides over 1 kilometre of control range in optimal conditions.

Specifications

• Frequency: 2.4GHz (2400-2483.5MHz)
• Protocol: FrSky D8
• Channels: 8
• Output format: SBUS
• Input voltage: 4.5–6.0V
• RSSI: Yes (Channel 9)
• Range: >1km
• Antenna length: 60mm
• Dimensions: 17 x 11 mm
• Weight: 2g

The R81 requires direct soldering to your flight controller's 5V, GND, and SBUS or RX pads. Binding is handled simply via the onboard bind button prior to powering up the flight controller.