Microhard Telemetry Radio V2

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

• 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

• 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