TETRA (Terrestrial Trunked Radio) training is a program designed to provide knowledge and skills necessary for operating TETRA radio communication systems. The training covers topics such as radio operations, call set-up and management, group calling, emergency procedures, network management, and troubleshooting.

TETRA is a digital mobile radio standard that defines the technical specifications for wireless communication systems used by public safety organizations, transportation companies, utilities, and other critical infrastructure entities. The TETRA standard is managed by the European Telecommunications Standards Institute (ETSI) and includes a range of features and capabilities designed to ensure secure, reliable, and efficient communication.

DMR (Digital Mobile Radio) and TETRA (Terrestrial Trunked Radio) are both digital radio communication standards used in professional and public safety applications. The main difference between the two is that DMR is a non-cellular system, while TETRA is a cellular system. This means that TETRA can provide broader coverage and better reliability in large-scale deployments, but DMR is more flexible and easier to deploy in smaller-scale applications.

TETRA radio can operate on a range of frequency bands, including VHF (136-174 MHz), UHF (380-430 MHz, 440-470 MHz), and 700/800 MHz. The specific frequency band used will depend on the requirements of the application and the regulatory environment in the location where the radio system is deployed.