Holybro Microhard Telemetry Radio P840 (Two Radio)
Holybro Microhard Telemetry Radio P840 (Two Radio) - Image 2
Holybro Microhard Telemetry Radio P840 (Two Radio) - Image 3
SKU: DRFC-2119
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Holybro Microhard Telemetry Radio P840 (Two Radio)

₹62,848.00 (Inclusive of all taxes)
Out of Stock

The Holybro Microhard Telemetry Radio P840 is a high-performance, long-range RF module designed for robust UAV telemetry and command & control links. Operating in the 840 MHz ISM band, it supports DC 7-35V input and delivers reliable, low-latency serial communication for integration with flight controllers like Pixhawk and ArduPilot.

Features

  • Long-Range Telemetry: Provides reliable wireless serial communication with a range of up to 100 km (60 miles) in the 840 MHz ISM band.
  • Wide Voltage Input: Integrated high-voltage BEC supports DC 7-35V power input, compatible with 2S to 6S LiPo batteries.
  • Robust Data Link: Features Frequency Hopping Spread Spectrum (FHSS) technology, 32-bit CRC error detection, and configurable ARQ for reliable data transfer.
  • Direct Flight Controller Integration: Includes a 6-position JST-GH connector for direct plug-in to TELEM ports on Pixhawk and other autopilots.
  • Dual-Radio Kit: Package includes two complete P840 radio units, antennas, and cabling for establishing a point-to-point or point-to-multipoint link.

Out of stock

Description

The Holybro Microhard Telemetry Radio P840 integrates the industrial-grade Microhard Pico Series RF module, engineered for mission-critical UAV telemetry and command links. It utilizes Frequency Hopping Spread Spectrum (FHSS) technology in the 840 MHz band to provide a robust, license-exempt wireless serial connection resistant to interference, with configurable data rates up to 276 kbps and optional forward error correction.

Designed for seamless integration into drone systems, the module features an onboard high-voltage BEC accepting 7-35V DC, making it compatible with a wide range of power sources from 2S to 8S LiPo setups. The unit includes a USB Type-C port with an integrated USB-to-UART converter for easy configuration via AT commands or the dedicated PicoConfig application, alongside LED indicators for UART activity and three-stage RSSI strength.

Key Features

  • Microhard P840 RF Core: Delivers high-performance, long-range serial communications in the 840-840.5 MHz ISM band.
  • FHSS Technology: Employs Frequency Hopping Spread Spectrum for enhanced interference resistance and link reliability.
  • High-Voltage Power System: Integrated BEC supports a wide input range of DC 7-35V, suitable for direct connection to flight battery or PDB.
  • Direct Flight Controller Interface: 6-pin JST-GH connector allows plug-and-play connection to telemetry ports on Pixhawk, Cube, and other autopilots.
  • Advanced Diagnostics: Separate diagnostic port enables transparent remote diagnostics and online network control and monitoring.
  • Robust Error Handling: Features 32-bit CRC, selectable packet retransmission (ARQ), and configurable forward error correction (FEC).
  • LED Status Indicators: Includes UART transmission LED and a three-stage RSSI LED for immediate link quality assessment.

Applications

  • Long-Range Fixed-Wing & VTOL UAVs: Establishing robust telemetry and command links for mapping, surveillance, and payload delivery missions beyond visual line of sight (BVLOS).
  • Industrial & Agricultural Drones: Reliable data transmission for real-time sensor data, camera feeds, and flight commands in challenging RF environments.
  • Search & Rescue (SAR) Operations: Providing a dependable communication backbone for drones operating at extended ranges in varied terrain.
  • ArduPilot & PX4 Autopilot Integration: Direct connection to Pixhawk-series and other flight controllers for comprehensive ground control station (GCS) telemetry.
  • Mesh Network Backbone (with P900 variant): Building resilient, self-healing communication networks for drone swarms or multi-vehicle operations (Note: Mesh not available on P840).

Technical Specifications

Item TypeTelemetry Radio
Frequency Band840 MHz (P840)
Operating ModePoint-to-Point, Point-to-Multipoint
Transmit Power20-30 dBm
Data Rate (Baud)300 bps to 230 kbps (Up to 276 kbps link rate)
Maximum RangeUp to 100 km (60 miles)
Input VoltageDC 7 ~ 35V
Current Consumption (Sleep)< 1 mA
Current Consumption (Idle)3.5 mA
Current Consumption (Receive)45 mA to 98 mA
Current Consumption (Transmit)1000 mA to 1400 mA
Error Detection32-bit CRC
Interface6-position JST-GH, USB Type-C (with UART converter)
Weight (without antenna)42 g
Weight (with antenna)69 g

Frequently Asked Questions

What is the difference between the Holybro P840 and P900 Microhard radios?

The primary difference is the operating frequency band. The P840 operates in the 840-840.5 MHz ISM band, while the P900 operates in the 902-928 MHz ISM band. You must select the model compliant with your country's regulations. Additionally, the P900 variant supports true mesh networking, a feature not available on the P840 model which is limited to point-to-point and point-to-multipoint topologies.

How do I power and connect the Holybro P840 radio to my flight controller?

The module is powered via its XT30 input, accepting 7-35V DC, which can be connected directly to a 2S-6S LiPo battery or a regulated power source. For data, use the included 6-pin JST-GH cable to connect the radio's 'Data' port directly to the TELEM port on compatible flight controllers like Pixhawk. The onboard high-voltage BEC eliminates the need for an external regulator.

How do I configure the Holybro Microhard P840 radio?

Configuration is performed via AT commands sent through the data UART or more conveniently using the Microhard PicoConfig Windows application via the module's USB Type-C port (which has an integrated USB-to-UART converter). The separate diagnostic port can also be used for advanced network control and remote diagnostics.

What is the realistic range I can expect from the P840 radio?

Under ideal line-of-sight conditions with proper antenna placement, the P840 can achieve ranges up to 100 km (60 miles). Actual range is highly dependent on environmental factors like terrain, obstacles, antenna gain, and transmit power settings. The Frequency Hopping Spread Spectrum (FHSS) technology helps maintain a reliable link in the presence of interference.

Package Includes

  • 2x Microhard P840 Telemetry Radio Unit
  • 2x Antenna
  • 2x XT30 Power Cable
  • 1x GH 6-Pin to 6-Pin Cable
  • 1x Metal Pin

Additional Information

Weight 0.27 kg
Dimensions 15 × 24 × 5 cm

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