Abstract: A testing device determines an Effective Isotropic Radiated Power (EIRP) of a wanted signal at a beam-peak direction and a maximum Total Radiated Power (TRP) of the wanted signal. The testing device then determines a power difference (?P) between the EIRP of the wanted signal at the beam-peak direction and the maximum TRP of the wanted signal. The testing device determines EIRP of a spectral emission mask (SEM) at each measurement bandwidth step at the beam-peak direction. The testing device then determines TRP at each measurement bandwidth step by determining a difference between the EIRP of the SEM at that measurement bandwidth step and the power difference (?P). The testing device compares the TRP at each measurement bandwidth step to a SEM specification, and reports whether the SEM specification has been met.