HF testing equipment for testing mobile communications terminals emulates the D2D communications capabilities of at least two mobile communications terminals. Using this equipment, interfering radio transmissions that may occur as a result of randomly selected frequency resources are replicated to test the effect thereof in a mobile communications terminal. A channel model of a transmission channel is emulated, and distortion is impressed on the data signal to be transmitted by means of the model. One baseband data signal in the frequency domain is thus obtained for each transmission channel, and this data signal contains the effects of a particular transmission channel on an undistorted data signal. The various baseband data signals are linked together, e.g., by complex multiplication, and transformed into the time domain. A receipt signal for a mobile communications terminal to be tested, produced by taking account of transmission channels and the accompanying channel distortion, is thus emulated.