QRadioLinkQRadioLink
Software Defined Radio
Software Defined Radio
Details about the attempt to develop a multi-carrier DMR, YSF, M17 digital voice system. Technical description of the system, issues encountered and possible solutions. An example of an operational multi mode multi channel SDR digital voice hotspot.
Unlike the previous implementation which did not leverage the full TDMA mode used in the land-mobile radio standard DMR, this article describes a software defined radio implementation capable of operating in both timeslots of DMR
Some of us, including me, use a SDR device for most of their amateur radio activities, and want to adapt their SDR to a multitude of tasks, to avoid using multiple hardware device types for the same job. So here is a digital voice MMDVM hotspot that uses a device like the PlutoSDR or LimeSDR
Researching the possibility of setting up an Internet (or HAMNET as known to amateur radio operators) connection over the QO100 amateur radio geostationary satellite.
Using a LimeNET-Micro remote controlled standalone transceiver with GNU Radio, QRadioLink and voice over IP to access amateur radio FM repeaters and more.
Amateur radio FT8 distance contacts on 144 MHz with the PlutoSDR and 20 Watts output power.
A brief description of a slightly unconventional 4FSK decoder with Viterbi soft symbol decoding for convolutional code.
A closer look at the digital voice modes employed by QRadioLink, how they work, when they are best used and some technical characteristics.
Choosing the right RF power amplifier for your SDR device
Support for the most common amateur radio digital modes: DMR, D-Star, Yaesu System Fusion