Mayatech RFD900A 1W Telemetry Kit

Mayatech RFD900A 1W is a high-performance dual-channel radio modem for telemetry transmission, designed for drones, UAV systems, and other applications requiring reliable long-range communication. Manufacturer: Mayatech. Product category: Drones & Quadcopters > Drone Antennas.

Model Updates

• New 32-bit ARM processor for enhanced performance and stability.
• Supports air data rates up to 500 kbps for fast telemetry and payload transmission.
• Hardware AES encryption for secure data link.
• Supports PPM passthrough from the remote control (PPM must have 3.3V levels) and simultaneous telemetry reception.
• Full static electricity protection and filtering on each I/O port for increased reliability.
• Supports SiK firmware with Point-to-Point modes and simultaneous connection capabilities.
• Asynchronous "multi-point" broadcasting (currently available in beta).

Key Features

• Communication range over 40 km depending on antennas and radio channel settings; record performance up to 80 km with line-of-sight.
• 2 x RP-SMA RF connectors in Diversity mode for automatic real-time switching to the best antenna.
• 1W (+30 dBm) output power for long-range capability.
• Low-pass filter (LPF) on transmit, reducing noise on spurious channels.
• Low-noise receive amplifier with over 20 dB gain.
• SAW filter on receive for improved reception stability in noisy environments.
• SiK and Multipoint SiK firmware implemented, easy to configure and field-upgradable.
• Compact and lightweight module, convenient for integration into various platforms.
• Compatibility with 3DR/Hope-RF radio modems for flexible integration with existing systems.

Interfaces

• RF: 2 x RP-SMA.
• Serial port: TTL logic levels (+3.3 V).
• Power: 5 V; approximate pulse current up to 800 mA at maximum transmit power.
• General purpose I/O ports: 6 pcs (supports digital inputs/outputs, ADC, PWM).

Software Solutions and Configuration

• Open-source firmware named "SiK", ported for 32-bit ARM architecture.
• Bootloader interface available for development and firmware updates via serial port.
• Most parameters are configured using AT commands (ground module uses AT prefix, remote module uses RT): baud rate, operating frequency, power, etc., can be changed without direct connection to the onboard unit.
• Supports configuration via APM Planner for integration with popular control software.
• Default settings: 57600 baud, 8/N/1 and 64 kbps air speed (payload + service information + error correction).

Operational Features

• High interference immunity due to Frequency Hopping Spread Spectrum (FHSS).
• Transparent serial port (UART) for easy data exchange with flight controllers.
• Ability to operate in "point-to-point" or "multipoint" modes.
• Configuration via AT commands for the ground module and RT commands for the onboard module.
• User-controlled system and air bitrate, error correction mechanisms, and optional MavLink protocol packing.
• MavLink transmission of radio channel status (RSSI and noise level from base and ground station).
• Automatic antenna switching in Diversity mode and reduced transmission time to prevent overheating.

Technical Specifications

• Frequency range: 902 - 928 MHz.
• Output power: 1 W (+30 dBm) with 1 dB adjustment steps.
• Interfaces: UART (3.3 V), 6 GPIO (ADC, PWM, digital pins).
• RF connectors: RP-SMA Jack (2 pcs).
• Air data rates: 4, 8, 16, 19, 24, 32, 48, 64 (default), 96, 128, 192, 250 and 500 kbps.
• UART speeds: 9600, 19200, 38400, 57600 (default), 115200, 400000, 921000 baud.
• Receive sensitivity: >121 dBm at low data rates.
• Mounting: M2.5x3 + 3 solder points.
• Supply voltage: 5 V (range 3.5 - 5.5 V).
• Current consumption: approximately 800 mA at maximum power.
• Operating temperature range: -40 - +85 °C.
• Dimensions: 57 x 30 x 12.8 mm (including shield, heatsink, and connectors).
• Weight: 14.5 g.

Package Contents

• Radio module — 2 pcs.
• Dipole antennas — 4 pcs.
• USB-MicroUSB cable — 1 pc.
• Signal cable for soldering — 1 pc.

The Mayatech RFD900A 1W Telemetry Kit is ideal for professionals and enthusiasts requiring reliable long-range communication: from extended-range flights to integration into MavLink systems. The module combines a modern hardware base (ARM 32-bit, AES), high output power, a wide range of interfaces, and software customization options for your project. Brand: Mayatech.

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