Holybro Microhard Telemetry Radio(P400)

austarsmodel@yahoo.com (Austars Model Pty Ltd) — Thu, 06 Feb 2025 10:15:36 +0800

Holybro Microhard Telemetry Radio(P400)

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

Feature

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

Specification

	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
Range	Up to 40 miles (60 km)	Up to 60 miles (100 km)	Up to 60 miles (100 km) @ 19.2 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 < 1mA Idle 3.5mA Rx: 45mA to 98mA Tx: 1000mA to 1400mA	Sleep < 1mA Idle 20mA Rx: 45mA to 98mA Tx Peak: 2A	Sleep < 1mA Idle 20mA Rx: 45mA to 98mA Tx Peak: 2A
Error Detection	32 bits of CRC, ARQ
Weight	44g (without antenna) 71g (with antenna)	44g (without antenna) 71g (with antenna)	44g (without antenna) 67g (with antenna)

Other Technical details and download can be found in Holybro Documentation page.

Reference Links

Ports & Button
Status LED Meaning
Default Setting
Pinout
Dimension
Enabling RTS / CTS Flow Control
Point-to-Multipoint Setup
Downloads

SKU17024/17019/17026 Includes:

1x Microhard P840/P900/P400 Radio
1x Antenna
1x XT30 Power cable
1x GH 6P to 6P cable
1x Metal Pin

SKU17025/17020/17027 Includes:

2x Microhard P840/P900/P400 Radio
2x Antenna
2x XT30 Power cable
1x GH 6P to 6P cable
1x Metal Pin

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Holybro Microhard Telemetry Radio(P400)

Feature

Specification