This is a repository for an implementation of Terrestrial Trunked Radio (TETRA) using software defined radios. The goal is to implement a direct-mode (DMO) repeater and a trunked-mode (TMO) base station.
The system consists of multiple pieces from different repositories, which are pulled in here as git submodules.
Supported radios are those providing a SoapySDR module, full duplex capability and timestamp support. This includes at least the LimeSDR, LimeSDR Mini, XTRX, BladeRF and various USRP models. Most experimentation so far has happened on various LimeSDR models, so that's recommended.
Due to the lack of full duplex and/or transmit timestamp support, devices such as ADALM-PLUTO and HackRF are not guaranteed to work properly. Some support for these is possible in the future.
Recommended operating system is Ubuntu Linux running on any laptop, server or desktop computer. Raspberry Pi 3 or 4 running Raspbian or other single-board computers running Armbian can be used as well. Several other platforms may work but have not been tested.
The following steps have been tested to work on a fresh installation or a container based on Ubuntu 18.04.
sudo apt install git
cd
git clone https://github.com/OH2NXX/HamTetra.git
cd HamTetra
git submodule init
git submodule update
# Skip install_limesdr.sh if LimeSDR drivers and SoapySDR are installed
# already. Avoid installing a mixture of multiple versions.
install/install_limesdr.sh
install/suo_dependencies.sh
install/build_liquiddsp.sh
install/build_suo.sh
install/osmo_dependencies.sh
install/build_osmocore.sh
install/build_osmotetra.sh
The installation scripts will occasionally ask for your password in order to use sudo. On distributions other than Ubuntu or Debian, try to find the equivalent packages for the dependencies and install them manually.
To transmit a DMO repeater presence signal, start:
osmo-tetra-dmo/src/hamtetra_main2
It should print a help for command line parameters. Fill in your SDR hardware and TETRA frequency and it should start transmitting. If changes to some other configuration is needed, edit the source code.