LimeNet Micro

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LimeNet Micro SDR


A Software Defined Radio for Everyone

Limenet Micro SDR can drive low-cost, multi-lingual cellular base stations and wireless IoT gateways, and are used for various academic, industrial, hobbyist, and scientific SDR applications, such as radio astronomy. This is a board that will allow you to do a lot of RF hacking.

LimeNET Micro makes deploying wireless networks more accessible than ever before, by extending the LimeNET line of integrated hardware solutions via an ultra-low cost platform that is capable of supporting narrowband systems, such as GSM and IoT wireless standards, in a stand-alone configuration.

As with existing integrated LimeNET platforms, the new LimeNET Micro is built on the very same revolutionary field-programmable RF (FPRF) technology and features the LMS7002M transceiver at its heart. However, this highly cost-optimised, single board solution also integrates GPS for high-accuracy timing, active Power-over-Ethernet (PoE), and embedded compute for fully standalone operation.

In utilising the Raspberry Pi Compute Module 3+, LimeNET Micro builds on previous platforms to further democratise wireless networks in much the same way that the Raspberry Pi has democratised embedded computing.

Given its incredibly low price point and highly integrated nature, there are endless application possibilities for LimeNET Micro, ranging from cellular networks and IoT, through spectrum monitoring, test and measurement, amateur radio, and radio astronomy.

Example Use Cases

    Inexpensive enterprise and personal networks
    Rural, autonomous, and resilient networks
    Universal IoT communications hubs
    Rapid deployment infrastructure for emergency response
    Remote radio solutions for amateur radio and radio astronomy
    Integration into application-specific RF appliances
    Radio spectrum survey
    Passive wireless geolocation
    PHY and security research
    RF-aware robotics

Features & Specifications

    RF transceiver: Lime Microsystems LMS7002M
    FPGA: Intel Altera MAX 10 (10M16SAU169C8G)
        169-pin FBGA package
        16K LEs
        549 KB M9K memory
        2,368 KB user flash memory
        4 x fractional phase locked loops (PLLs)
        45 x 18x18-bit multipliers
        130 x general purpose input/output (GPIO)
        Single supply voltage
        Flash feature
        FPGA configuration via JTAG
    GNSS module: u-blox NEO-M8Q-0-10
        Supports BeiDou, Galileo, GLONASS, GPS / QZSS
        Able to concurrently receive up to three GNSS
        –167 dBm navigation sensitivity
    EEPROM memory: 2 x 128 KB for RF transceiver MCU firmware and data
    Flash memory: 1 x 4 MB flash memory for data
    General user inputs/outputs:
        5 x dual color (red + green) LED
        8 x FPGA GPIO pinheader (3.3 V)
        4 x FPGA switches
        1 x buzzer
        2 x coaxial RF (SMA) connectors (each can be switched between high and low frequency bands)
        SMA connector for external clock source in
        SMA connector for clock source out
        SMA connector for GNSS antenna
        Raspberry Pi Touch Screen Display Connector (ribbon cable)
        Raspberry Pi Camera (ribbon cable)
        HDMI connector
        2 x USB 2.0 ports
        3.5 mm audio out (Raspberry Pi Compute Module)
        FPGA GPIO headers
        FPGA JTAG connector
        RJ45 connector for Ethernet and IEEE 802.3 active Power-over-Ethernet (PoE)
        DDR2 SODIMM connector - only usable for Raspberry Pi Compute Module 3 (or Lite)
        MicroSD slot for RPi Compute Module storage
        Barrel connector for 12 V DC power
        Micro-USB for USB boot of Compute Module
    Clock system:
        30.72 MHz OCXO: Rakon U7475LF
        GPS disciplined for high frequency accuracy and stability
        External clock input via SMA connector
        Clock output via SMA connector
    Board dimensions: 125 mm x 65 mm

Raspberry Pi Compute Module (CM3) Features

A Raspberry Pi Compute Module 3+ is included with every purchase of a LimeNET Micro (excluding early bird units). Raspberry Pi Compute Module 3+ Lite‘s will also work with LimeNET Micro, but would require use of the separate microSD slot.

    ARM Cortex-A53 Broadcom BCM2837 SoC - quad-core, 1.2 GHz
    1 GB RAM
    8 GB eMMC flash

Free & Open Source

As with the LimeSDR family, the LimeNET Micro is a free and open source project. We will be releasing code, firmware, schematics, layout, and associated project files via MyriadRF shortly.
Lime Suite

The LimeNET Micro uses the same host-side software as previous LimeNET integrated systems, called Lime Suite. Lime Suite is entirely open source and supports a variety of software-defined radios and APIs. You can learn more about Lime Suite at its GitHub repository and MyriadRF project page.

PantaHub lets you connect your devices and transform them into bare-metal infrastructure. Designed for deeply embedded and high-grade enterprise systems alike, the Pantavisor device agent and PantaHub are the perfect choice for the management of Linux devices and their firmware lifecycles.

The PantaHub base image will be pre-loaded onto all Compute Modules included in the Aluminum Kit.


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