LibreCellular Update 3: Band 3 Medium Power Amplifier

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…

LibreCellular Project Update

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.

OTA: QO-100 FreeDV Transmissions, Lime-Powered 5G Testbeds, O-RAN Code, and More

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…

OTA: Lower-Cost LimeRFE, WSPR Experiments, LoRaWAN World Records, and More

The LimeRFE crowdfunding campaign has a new, lower-cost option: the same programmable software-defined front-end board but without the components needed to operate in cellular bands, as an alternative for radio amateurs. “We’ve had some enquiries as to whether it would be possible to make a reduced cost version of LimeRFE…
LimeRFE, in hand

Call for GSoC 2018 Students

We are delighted once again to be participating in Google Summer of Code as a mentoring organisation with the Free and Open Source SIlicon Foundation. Stefan Wallentowitz, FOSSi Foundation Director, notes “Google Summer of Code is an excellent program for students to get a stipend by Google to work on…

WM4: Advance Digital Radio

The fourth instalment of the Wireless Masterclass series has been published to YouTube and this takes a look at advance digital radio, with Dr Danny Webster exploring topics including, detecting and reducing data loss, spread spectrum, OFDM and MIMO. If you missed the previous episodes these can be found at:…

LimeSDR Made Simple Part 9: It’s a VNA Too

Welcome to the ninth episode in the LimeSDR Made Simple series. Since the first we’ve been gradually adding more tools to the SDR toolbox and if you have followed the series along, by now the operation of the LimeSDR should be well and truly demystified. Last time we looked…

WM #3: The Real Radio Link

The third instalment of the Wireless Masterclass series has now been published to YouTube and this takes a look at the real radio link, with Dr Danny Webster covering topics including the noise floor and line-of-sight link budgets, bad neighbours, and receiver and propagation effects on received signals. This is…