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Overview

Hardware device support

QRadioLink works with several different SDR devices and RF frontends. See the complete list of supported hardware devices here: Hardware support

Digital transmission and reception

QRadioLink supports tranmission and reception of several digital voice, video, text and IP packet modes. Digital voice modes use open source audio codecs: Codec 2 and Opus.

Codec 2 is an open source speech codec designed for communications quality speech between 700 and 3200 bit/s. The main application is low bandwidth HF/VHF digital radio. It fills a gap in open source voice codecs beneath 5000 bit/s and is released under the GNU Lesser General Public License (LGPL).

Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but is also intended for storage and streaming applications. It is standardized by the Internet Engineering Task Force (IETF) as RFC 6716 which incorporated technology from Skype’s SILK codec and Xiph.Org’s CELT codec. Although Opus was not intended to be used for digital voice transmissions over a radio channel, some of the modems in QRadioLink use it successfully for this purpose.

See Digital radio features for more details.

MMDVM repeater mode

QRadioLink can act as a MMDVM base station duplex repeater with TDMA support (DMR, System Fusion, D-Star, M17) using LimeSDR and Ettus USRP devices. Both single carrier and multi-carrier transmission are supported. See MMDVM mode documentation for more details.

DMR Tier III trunked radio base station

QRadioLink can act as a duplex DMR Tier III trunked radio base station using LimeSDR and Ettus USRP devices. The trunked base station can transmit at most one control channel and 6 payload channels.

See DMR trunked radio documentation for more details.

Analog transmission and reception

QRadioLink supports tranmission and reception of several analog radio voice modes. See Analog radio features for more details.

VOIP interconnection

QRadioLink can connect over the LAN or Internet to other programs like Mumble or Plumble. It can stream received radio signals to other computers and base radios also using QRadioLink. See VOIP features for more details.

QRadioLink can interoperate with SVXlink to create a network of repeaters or simplex radio nodes. See SVXLink features for more details.

Other features

Other general program features can be found here: Other features for more details.