Radio systems and receivers: choosing a reliable control link
Channels, receiver protocols, telemetry, range, redundancy and what to check before matching a transmitter to a model.
Holybro Microhard Telemetry Radio
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Contact RC-MODEL for current availability, technical fit, compatible accessories and a formal quote.
Holybro Microhard Telemetry Radio is a Holybro catalog item in Telemetry & Data Links. Review the model details below and request compatibility and supply information for civilian use.
Model specifications
| Brand | Holybro |
|---|---|
| Model | Microhard Telemetry Radio |
| Input Voltage | DC7~35V(4-position JST-GH) |
| Error Detection | 32 bits of CRC, ARQ |
| Antenna Gain | 5dBi |
Manufacturer technical notes
Holybro Microhard Telemetry Radio integrates microhard Pico Series RF module which is capable of delivering high-performance wireless serial communications in robust topologies, such as Point to Point, Point to Multipoint and secure Mesh (Mesh only available on P900).It uses frequency hopping spread spectrum (FHSS) technology, providing reliable wireless asynchronous data transfer between most equipment types which employ a serial interface. Fixed frequency is available on the P840 version. The radio is configured using AT commands through the Data port or using PicoConfig application through the Diagnostic Port.P900 Radio operate within the 902-928 MHz ISM frequency band while the P840 operate within 840-845Mhz, and P400 operate within 410-480MHz. You can select your radio based on your country's available frequency band.
FCC ID: NS913P900
USB Type-C port, integrated USB to UART converter
6-position JST-GH connector, can be directly connected to the TELEM port on various flight controller
High voltage BEC onboard, Support DC7~35V voltage supply
UART transmission LED indicator
Three-stage RSSI LED indicator
Transmission within a public, license-exempt band of the radio spectrum
Transparent, low latency link rates up to 276 kbps (P900) and 345 kbps (P860 & P400)
Supports a robust true Mesh operation with auto-routing (P900 Only)
32 bits of CRC, selectable retransmission and forward error correction
Separate diagnostics port, transparent remote diagnostics and online network control
Other Technical details and downloads can be found on the Holybro Documentation page.
Reference Links
Status LED Meaning
Default Setting
Enabling RTS / CTS Flow Control
Point-to-Multipoint Setup
1x Microhard P840/P900/P400 Radio
1x XT30 Power cable
1x GH 6P to 6P cable
2x Microhard P840/P900/P400 Radio
2x XT30 Power cable
Manufacturer technical and configuration tables
| P900 | P840 | P400-C1S | |
|---|---|---|---|
| Frequency Range | 902 to 928 MHz | 840 to 845 MHz | 410 to 480 MHz |
| Transmit Power(software adjustable) | 100mW to 1W (20-30dBm) | 100mW to 1W (20-30dBm) | 100mW to 1W (20-30dBm) |
| Link Rate | Up to 276 kbps | Up to 345 kbps | Up to 345 kbps |
| Serial Baud Rate | Up to 230.4 kbps asynchronous | 300 bps to 230 kbps | |
| Spreading Method | Frequency Hopping Spread Spectrum (FHSS) | Frequency Hopping/Fixed Frequency,GMSK, 2GFSK, 4GFSK, QPSK | Frequency Hopping,GMSK, 2GFSK, 4GFSK, QPSK |
| Operating Modes | Mesh, Point-to-Point, Point-to-Multipoint, Store and Forward,Auto Routing, Self Healing, Packet Routing Modes | Point-to-Point, Point-to-Multipoint,Store & Forward Repeater, Peer-to-Peer | |
| Input Voltage | DC7~35V(4-position JST-GH) | ||
| Power Consumption | Sleep < 1mAIdle 3.5mARx: 45mA to 98mATx: 1000mA to 1400mA | Sleep < 1mAIdle 20mARx: 45mA to 98mATx Peak: 2A | Sleep < 1mAIdle 20mARx: 45mA to 98mATx Peak: 2A |
| Error Detection | 32 bits of CRC, ARQ | ||
| Antenna Gain | 5dBi | ||
| Weight | 44g (without antenna) 71g (with antenna) | 44g (without antenna) 71g (with antenna) | 44g (without antenna) 67g (with antenna) |
Manufacturer catalog configurations
| Configuration | Manufacturer SKU |
|---|---|
| P900 / One Radio | 17019 |
| P900 / One Pair (Two Radios) | 17020 |
| P840 / One Radio | 17024 |
| P840 / One Pair (Two Radios) | 17025 |
| P400-C1S / One Radio | 17026 |
| P400-C1S / One Pair (Two Radios) | 17027 |
Product inquiry
Availability, price, package contents and hardware revision are confirmed on inquiry. This listing does not assert local stock, a delivery date or official distributor status. Confirm voltage, connectors, firmware and operating requirements before use.
- Original manufacturer model information
- Manufacturer documentation
- Manufacturer documentation
- Manufacturer documentation
- Manufacturer documentation
- Manufacturer documentation
- Manufacturer documentation
- Manufacturer documentation
- Manufacturer documentation
Manufacturer Resources
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