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LimeSDR enables multi-carrier, multi-standard amateur radio base stations based on MMDVM
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Info about an interesting open source project targeting a wide range of RF
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configurations, including amateur radio: The following is from -- Below this general info, I'm forwarding a note about using this platform for amateur radio digital voice. Jim - K6JM A Software Defined Radio for Everyone LimeSDR is a low cost, open source, apps-enabled (more on that later) software defined radio (SDR) platform that can be used to support just about any type of wireless communication standard. LimeSDR can send and receive UMTS, LTE, GSM, LoRa, Bluetooth, Zigbee, RFID, and Digital Broadcasting, to name but a few. While most SDRs have remained in the domain of RF and protocol experts, LimeSDR is usable by anyone familiar with the idea of an app store - it's the first SDR to integrate with Snappy Ubuntu Core. This means you can easily download new LimeSDR apps from developers around the world. If you're a developer yourself, you can share and/or sell your LimeSDR apps through Snappy Ubuntu Core as well. The LimeSDR platform gives students, inventors, and developers an intelligent and flexible device for manipulating wireless signals, so they can learn, experiment, and develop with freedom from limited functionality and expensive proprietary devices. Top (left) and bottom (right) of the LimeSDR PCBA From Radio Astronomy to Personal Telcos Here are just some of the applications that are possible with the LimeSDR: * Radio astronomy * RADAR * 2G to 4G cellular basestation * Media streaming * IoT gateway * HAM radio * Wireless keyboard and mice emulation and detection * Tire pressure monitoring systems * Aviation transponders * Utility meters * Drone command and control * Test and measurement * Many more... With state-of-the-art technical specs, fully open hardware and toolchain, and integration with Snappy Ubuntu Core's app distribution platform, LimeSDR is limited only by our collective imagination. -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Adrian M Sent: Saturday, September 3, 2022 1:52 AM To: [email protected] Subject: [OpenDV] LimeSDR enables multi-carrier, multi-standard amateur radio base stations based on MMDVM Using LimeSDR equipment (LimeNET-Micro / LimeSDR-mini) and MMDVM + GNU Radio as core components, the implementation of a full duplex SDR base station was created in order to support the DMR, System Fusion, D-Star and M17 amateur digital voice standards in a multi-carrier configuration, with up to 7 transmitted carriers within 200 kHz bandwidth, in any combination of operating modes and with a configurable channel separation. The channel / mode matrix is entirely user configurable by using multiple MMDVM instances, each of them dedicated to one operating channel. The long term goal is to continue software development and combine LimeSDR equipment with the LimeRFE front-end and capable computing hardware to supply a self-contained, easily deployable base station in NITB style. The end-user should only need to supply their own antennas, power amplification and duplexing hardware for a complete SDR base station solution. The current testing status has confirmed operation of the DMR and System Fusion standards, while D-Star and M17 modes are still theoretical and need to be tested. There is interest in further extended support for the new M17 open digital voice standard and investigating how a multi-carrier approach can provide amateur radio operators new avenues of experimentation with topics like trunking, multiple access, IP network facilities and other such topics. Work is in progress to improve code, refine user documentation and create deployable packages. A video demonstrating the operation of a four-channel mixed DMR and System Fusion duplex repeater system can be seen here: All credit for the work supporting this project goes to Jonathan Naylor, Peter Rakesh and all the people who created or contributed to MMDVM and GNU Radio along the years. Regards, Adrian |
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