The present document applies to categories of digital terrestrial television transmitter defined according to table 1.1 and table 1.2. The output power classification (table 1.1) and emission classification (table 1.2) are combined to define a transmitter category. For example@ power classification H and emission classification 0 denotes a high power transmitter (category H0) whose OOB emissions comply with a non-critical mask. The present document contains requirements to demonstrate that radio equipment both effectively uses and supports the efficient use of radio spectrum in order to avoid harmful interference.