Category: Uncategorised

New cellular software stack and base station design. A new cellular software stack configuration has been published, which is much more feature rich and provides support for VoLTE and SMS, along with a new design for base station hardware. PyHSS, Open5GS and Kamailio IMS Deployment tooling, container images and configuration…

The srsRAN 4G fork with native LimeSDR hardware support has received a long overdue update, and a new RF front-end has been developed which provides a highly convenient solution for those building base stations, both of the small cell and wider coverage type.

New CI RAN subsystem plus clock distribution and RF duplexer boards.

We are pleased to report that the next milestone has been achieved and it is now possible to set up a network to provide basic service.

We are pleased to report that the next milestone has been reached, whereby the srsRAN software is automatically built and deployed to a base station, together with eNodeB and EPC configuration, following which an end-to-end test is completed when a modem attaches to the network and a successful ping completes.

Initial version of a low cost 1800MHz power amplifier design completed and tested. In parallel to building out the CI hardware platform we’ve been working on the design for a low cost medium power amplifier for LTE Band 3. While suitable low power RF amplifiers are available at a modest…

Build and basic documentation has been completed for the subsystems which will be used in the initial LibreCellular CI hardware configuration.

Since the project was announced last year we’ve suffered a number of setbacks due to circumstances outside of our control. For example, the company we planned to use for customised rack mount enclosures exited the market due to pandemic related issues. However, we are pleased to report that we are now making good progress and a long overdue update follows.

The LimeSDR-powered Portsdown digital TV transmitter project has been featured in the latest issue of The MagPi Magazine, showcasing how low-cost software-defined radio is being used by the British Amateur Television Club (BATC). “Now Dave [Crump, chair of the BATC] has completed Portsdown 4, using the more powerful Raspberry Pi…

The team at Enjoy Digital has been testing out the upcoming LimeSDR Mini 2.0, and has already turned it into a self-contained computer through the porting of the open-source LiteX system-on-chip to the on-board FPGA — using a fully-open toolchain. Announced last month, the LimeSDR Mini 2.0 is designed to…

Lime Microsystems are just about to begin shipping the LimeRFE. This is a software-controlled multi-band and wideband PA and preamp, specifically designed to work with the LimeSDR. The initial specification is on the CrowdSupply website, but essentially it…

Lime Microsystems has published an interview with Gerhard Burian, David Rowe, and Steve Sampson on using FreeDV Mode 2020 for transmitting digital voice via the Es’Hail-2 satellite’s amateur radio transponder (QO-100) using just 1,600 Hz of radio frequency bandwidth. “The bandwidth regulation on the [QO-100] narrow band transponder, being 2,700…