Holybro Microhard Telemetry Radio integrates a 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 that employ a serial interface. The radio can be configured using AT commands through the Data port or using the PicoConfig application through the USB. V2 design now does not require a UART to USB adapter for configuration; a dedicated switch enables easy mode change to change firmware parameters.
P900 Radio operates within the 902-928 MHz ISM frequency band, and P400 operates within 410-480MHz. You can select your radio based on your region's legal frequency band.
Feature
- USB Type-C port, integrated USB to UART converter
- 6-pin JST-GH connector, which can be directly connected to the TELEM port on various flight controllers
- XT30 power port with high voltage BEC onboard, supports DC7~35V voltage supply
- UART transmission LED indicator
- Three-stage RSSI LED indicator
- Diagnostic Port 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
Specification
| P900 V2 | P400-C1S V2 | |
|---|---|---|
| Frequency Range | 902 to 928 MHz | 410 to 480 MHz |
|
Transmit Power (software adjustable) |
100mW to 1W (20-30dBm) | 100mW to 1W (20-30dBm) |
| Link Rate | Up to 276 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, 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 < 1mA Idle 3.5mA Rx: 45mA to 98mA Tx: 1000mA to 1400mA |
Sleep < 1mA Idle 20mA Rx: 45mA to 98mA Tx Peak: 2A |
| Error Detection | 32 bits of CRC, ARQ | |
| Antenna Gain | 5dBi | |
| Weight | 51g (w/o antenna) 81g (/w antenna) |
51g (w/o antenna) 76g (/w antenna) |
Other Technical details and downloads can be found on the Holybro Documentation page.
Reference Links
-
Ports & Button
- Status LED Meaning
- Default Setting
- Pinout
- Dimension
-
Enabling RTS / CTS Flow Control
- Point-to-Multipoint Setup
- Downloads
SKU17035/17037 Includes:
- 1x Microhard P900/P400 V2 Radio
- 1x Antenna
- 1x XT30 Power cable
- 1x XT60 Power cable
- 1x GH 6P to 6P cable
- 1x Type-C cable
SKU17036/17038 Includes:
- 2x Microhard P900/P400 V2 Radio
- 2x Antennas
- 1x XT30 Power cable
- 1x XT60 Power cable
- 1x GH 6P to 6P cable
- 1x Type-C cable
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