LEA-M8F - Multi-GNSS synchronisation for cost-sensitive network edge equipment

u-blox M8 Time & Frequency reference GNSS module

u-blox time and frequency products provide multi-GNSS synchronisation for cost-sensitive network edge equipment including Small Cell and Femto wireless base-stations. The LEA-M8F module is a fully self-contained phase and frequency reference based on GNSS, but can also be used as part of a complete timing sub-system including macro-sniff Synchronous Ethernet and packet timing.

The LEA-M8F module includes a low-noise 30.72 MHz VCTCXO meeting the master reference requirements for LTE Small Cells and provides 100 ppb autonomous hold-over across its full operating temperature range. The LEA-M8F module can also measure and control an external TCXO or OCXO for TD-LTE, LTE Advanced and other applications requiring extended holdover. External sources of synchronization are supported through time-pulse and frequency inputs and a message interface. This allows measurements from macro-sniff, Sync-E or packet timing to be combined with measurements from GNSS.

u-blox time and frequency products include timing integrity alarms that report phase and frequency uncertainty both during normal operation and hold-over. They feature a high dynamic range radio with both analog and digital interference mitigation supporting their inclusion as an integral part of a local area base station design.

Key Features:

  • Concurrent reception of GPS/QZSS, GLONASS, BeiDou
  • Integral disciplined low phase‑noise 30.72 MHz system reference oscillator
  • Accurate measurement and control of external oscillators
  • Industry leading acquisition sensitivity and single‑satellite timing
  • Autonomous 100 ppb hold‑over
  • Prepared for integration with external PTP, Sync‑E and network listen

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

LEA-M8F_Product Selector

Click here for the u-blox GNSS modules Linecard

Part Number Description Pack Size
LEA-M8F u-blox M8 Time & Frequency Reference module, Flash, VCTCXO, dual SAW, LNA
Reel of 250
EVK-M8F u-blox M8 Time & Frequency Reference evaluation kit, supports LEA-M8F Each

EVK-8 / EVK-M8 evaluation kits enable simple evaluation of the high performance u-blox 8 and u-blox M8 positioning technology. The built-in USB interface provides both power supply and high-speed data transfer, and eliminates the need for an external power supply.

u-blox 8 and M8 evaluation kits are compact, and their user-friendly interface and power supply make them ideally suited for use in laboratories, vehicles and outdoor locations. Furthermore, they can be used with a PDA or a notebook PC, making them the perfect companion through all stages of design-in projects.



  • Easy to use
  • Extensive visualization and evaluation features
  • Supports AssistNow Online and AssistNow Offline A-GNSS services
  • 1 USB port, 1 UART port, 1 I²C/SPI port (switchable)
  • All ports accessible outside
  • Power supply and data transfer over USB (USB V2.0 compatible)

The EVK-8 / EVK-M8 download includes u-center, which is an interactive tool for configuration, testing, visualization and data analysis of positioning chips and modules. u-center provides useful assistance during all phases of a system integration project.

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Last updated: 13 June 2018