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 < 1mAIdle 3.5mARx: 45mA to 98mATx: 1000mA to 1400mA Sleep < 1mAIdle 20mARx: 45mA to 98mATx 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
