• Beitian BK-122 GNSS module angled view with 6-pin connector and ceramic patch antenna base
  • Beitian GNSS module size comparison showing BK-252i, BK-182, and BK-122 boards with pin pads
  • Bottom view of Beitian GNSS module showing square ceramic patch antenna and board connector
  • Beitian GNSS module lineup promotional graphic with BK-252i, BK-182, and BK-122 shown
  • Beitian BK-220 GNSS integrated module product features chart with module and patch antenna images
  • Beitian BK-280 GNSS module application scenario graphic for drone, driverless car, electric vehicle
  • Package contents list: BK-182 series GNSS module, 4-pin serial cable (no lock), and 3M adhesive tape
  • Product parameter sheet for Beitian BE-122 GPS module showing size, weight, and supported systems
  • Product parameter sheet for Beitian BE-182 GPS module with module render and frequency bands list
  • Product parameter sheet for Beitian BK-122 GNSS module showing size and supported constellations
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Beitian M9140-KB GNSS Module w/ Patch Ceramic Antenna, Optional Compass (QMC5883L), for RC Flight Control

Beitian M9140-KB GNSS Module w/ Patch Ceramic Antenna, Optional Compass (QMC5883L), for RC Flight Control

Beitian

$27.66 USD
$27.66 USD
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Overview

This GNSS module series uses the M9140-KB (9th) chipset and an integrated patch ceramic antenna for positioning output over a serial port. Model options include compact PCB sizes for integration with flight control and other embedded systems, with selected variants adding a built-in electronic compass (QMC5883L is listed for compass versions).

Key Features

  • Horizontal accuracy: 1.5 m CEP (listed)
  • 92 searching channels (listed)
  • Update rate: 0.25 Hz to 25 Hz (default 1 Hz)
  • Serial output: TTL level; protocols: NMEA, UBX
  • Integrated patch antenna network design: impedance matching (50 ohm); antenna standing wave ratio less than 1.6 (listed)
  • Selected models with built-in electronic compass: QMC5883L / QMC5883 (as listed by model)
  • Support hot, warm and cold start command settings (listed)

Specifications

BK-122 module main performance indicators (listed)

Chip M9140-KB
Receiver type GPS L1 C/A, QZSS L1 C/A/S, GLONASS L1OF, BDS B1I, Galileo E1B/C, SBAS L1 C/A: WAAS, EGNOS, MSAS, GAGAN
Default position system GPS, GLONASS, BDS, GALILEO
Augmentation system SBAS, QZSS
Channel 92 Searching Channel
Sensitivity (Tracking & Navigation) -167 dBm
Sensitivity (Reacquisition) -160 dBm
Sensitivity (Cold start) -148 dBm
Sensitivity (Hot Start) -159 dBm
Horizontal position 1.5 m CEP
Velocity 0.05 m/s
Dynamic heading 0.3 deg
Time pulse RMS 30 ns; 99% 60 ns
Acquisition (Cold start) 24 s
Acquisition (Hot start) 2 s
Acquisition (Aided start) 2 s
Baud rate 4800 bps - 921600 bps, Default 115200 bps
Level TTL Level
Protocol NMEA, UBX
NMEA messages RMC, VTG, GGA, GSA, GSV, GLL
Update rate 0.25 Hz - 25 Hz, Default 1 Hz
FLASH With FLASH, the configuration can be changed, and the power will not be lost
Work restrictions High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g
Power (Voltage) DC Voltage 3.6 V - 5.5 V, Typical: 5.0 V
Power (Current) 45 mA / 5.0 V
Physical parameters (Size) 16.5 * 12.3 * 6.0 mm
Physical parameters (Weight) 3 g
Package Welding
Temperature (Operating) -40 C to +85 C
Temperature (Storage) -40 C to +105 C
LED PPS LED: Not positioned, the light is off; after 3D positioning, the blue light flashes

Model comparison (listed)

Model Chip Channel Sensitivity Horizontal Speed accuracy Acquisition Baud rate (bps) Output level Output protocol Update rate Work restrictions Voltage Current Size Weight Connector Compass
BK-122 M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 16.3 * 12.4 * 6.0 mm 3 g 1.00 pitch 4pin socket Not
BK-180 M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 18 * 18 * 6.0 mm 5 g 1.00 pitch 4pin socket Not
BK-182 M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 18 * 18 * 8.1 mm 5.8 g 1.00 pitch 4pin socket Not
BK-220 M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 22 * 20 * 6.2 mm 5.3 g 1.00 pitch 4pin socket Not
BK-220Q M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 22 * 20 * 6.2 mm 5.5 g 1.00 pitch 6pin socket Built-in QMC5883L
BK-250 M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 25 * 25 * 6 mm 8 g 1.00 pitch 4pin socket Not
BK-250Q M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 25 * 25 * 6 mm 9 g 1.00 pitch 4pin socket Built-in QMC5883L
BK-252Q M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 25 * 25 * 8 mm 13.5 g 1.00 pitch 6pin socket Built-in QMC5883L
BK-280 M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 28 * 28 * 8.4 mm 11.8 g 1.25 pitch 6pin socket Not
BK-280U M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps PL2303HX/TA chip TTL to USB driver, USB level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 28 * 28 * 8.4 mm 11.8 g 1.25 pitch 6pin socket Not
BK-357 M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 35 * 27 * 8.5 mm 13.9 g 1.25 pitch 6pin socket Not
BK-880 M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 28 * 28 * 11 mm 12 g 1.25 pitch 6pin socket Built-in QMC5883
BK-880Q M9140-KB 92 Searching Channel Cold start -148 dBm; Hot Start -159 dBm 1.5 m CEP 0.05 m/s Cold boot 24 s; Warm boot 2 s 4800 bps - 921600 bps, Default 115200 bps TTL level NMEA, UBX 0.25 Hz - 25 Hz, Default 1 Hz High 80,000 m; Speed 500 m/s; Gravitational acceleration <= 4 g DC 3.6 V - 5.5 V, typical: 5.0 V 45 mA / 5.0 V 28 * 28 * 8.5 mm 12 g 1.25 pitch 6pin socket Built-in QMC5883

NMEA-0183 data content (listed)

Get Parameters Get Content
GGA Time, position, number of satellites
GLL Longitude, latitude, UTC time
GSA GPS receiver operation mode, satellite used for positioning, DOP value, positioning status
GSV Visible GPS satellite information, elevation angle, azimuth angle, signal-to-noise ratio
RMC Time, date, position, speed
VTG Ground speed information

Test data (9th vs 10th generation tables shown)

Test Item 9th 10th
Capture sensitivity test Track -167 dBm -166 dBm
Capture sensitivity test Recapture -160 dBm -160 dBm
Capture sensitivity test Cold start -148 dBm -148 dBm
Capture sensitivity test Hot Start -159 dBm -160 dBm
Positioning accuracy test Horizontal Accuracy 1.5 m CEP 2.0 m CEP
Positioning accuracy test Speed Accuracy 0.05 m/s 0.05 m/s
Positioning accuracy test Dynamic Heading Accuracy 0.3 deg 0.3 deg
Positioning accuracy test 1PPS Time Precision RMS 30 ns; 99% 60 ns RMS 30 ns; 99% 60 ns
Startup time test Cold start 24 s 27 s
Startup time test Hot Start 2 s 1 s
Startup time test Auxiliary start 2 s 2 s
Power consumption test Voltage DC 3.6 V - 5.5 V, typical: 5.0 V DC 3.6 V - 5.5 V, typical: 5.0 V
Power consumption test Current 45 mA / 5.0 V 30 mA / 5.0 V

Pin Definition (BK-122, 4pin)

PIN Name I/O Description
1 RX I Serial Data Input.
2 TX O Serial Data Output.
3 VCC I DC 3.6 V - 5.5 V supply input, Typical: 5.0 V
4 GND G Ground

Wiring & Debugging (listed diagrams)

  • USB to TTL cable wiring: GND to GND, TX to RX, RX to TX, VCC to VCC.
  • Microcontroller wiring diagram labels: 1PPS, GND, TX, RX, VCC, BOOT (module) and IO, GND, TX, RX, VCC (single chip microcomputer).
  • Debugging: Connect to the computer using a USB to TTL adapter for configuration; PL-2303HX/TA chip USB to TTL level conversion cable is specified.

Mechanical Dimensions (module size diagram shown)

  • Overall: 16.50 ± 0.2 mm x 12.30 ± 0.2 mm
  • Additional marked dimensions: 12.00 mm; 6.1 ± 0.2 mm; 0.80 mm; 3.00 mm; 2.00 mm; 6.0 mm; 0.50 max; 11.80 mm; 10.45 mm; 2.60 mm; 2.20 mm

What's Included

  • GNSS module (model selected)
  • Some kits show a connector cable/harness included (model dependent)
  • BE-122 kit image: connector + module + thermal casing
  • BE-182 / BE-252Q kit images: connector + module + one piece of 3M glue

Applications

  • Flight control integration and embedded positioning output via serial port
  • Shared bike
  • Electric vehicle
  • Scientific research

Support & Documentation

  • Support Customization: It can be adjusted according to the product to meet requirements.
  • Support Customization: Various modules can be customized according to the sample.
  • Support Customization: Various modules can be customized according to the concept.
  • Complete Product Documentation: Provide rich development materials to help users use and secondary development.

For model selection help, wiring questions, or documentation access, contact support via https://rcdrone.top/ or email support@rcdrone.top.

Available Model Options (Shopify variants)

BK-122; BK-180; BK-182; BK-220; BK-250; BK-280; BK-357; BK-280U; BK-180i; BK-252i; BK-220i; BK-250i; BK-882; BK-882i.

Details

Support customization and complete product documentation for Beitian M9140-KB GNSS module series

Optional customization and downloadable documentation are available for integration and development needs.

Beitian BK-series GNSS module model comparison table (BK-122, BK-182, BK-2520 and variants)

Choose the module size and feature set that fits your flight controller build, with multiple BK-series options listed.

Beitian BK-122, BK-182 and BK-2520 module lineup with 1.5 m CEP note and chipset comparison

The M9140-KB platform targets fast satellite acquisition and stable positioning output for RC flight control projects.

Electronic compass heading section and star-search performance charts for compass-equipped module versions

Compass variants add heading support for navigation, alongside strong multi-constellation satellite tracking.

NMEA-0183 message list and “Accurate Data / Industrial Grade” feature highlights for the GNSS receiverSensitivity and positioning accuracy test tables comparing 9th vs 10th generation GNSS module performance

Lab-style test summaries list tracking sensitivity and horizontal accuracy figures for the M9140 generation.

Power consumption test and compact size comparison for BK-122, BK-182 and BK-2520 GNSS modules

Compact PCB footprints help match the right module size to your stack while keeping power draw low.

BK-122 main performance table with pin definition diagram for TX/RX/VCC/GND connections

Pin definitions make wiring simple for TTL serial GNSS output and power on embedded controllers.

Module dimensions plus pin wiring diagram for GPS module to USB‑TTL cable or microcontroller connection

Clear wiring diagrams cover basic TX/RX hookups for USB‑TTL configuration and direct MCU connections.

GNSS module debugging diagram (USB‑TTL to PC) and product display of multiple Beitian module variants

Configuration can be done over a USB‑to‑TTL adapter when connecting the module to a PC.

Application scenarios graphic: shared bike, electric vehicle, and scientific research positioning projectsProduct list showing connector + module + thermal casing / 3M glue options for BK-series GNSS modules

Accessory bundles can include wiring leads and mounting materials, depending on the selected model.

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