Radio equipment used in mobile services. Methods of measurement. Data equipment|Coding (data conversion), Radio receivers, Calling equipment (telephones), Testing conditions, Radio equipment, Electrical measurement, Type testing, Decoding, Radiofrequencies, Mobile communication systems, Radiotelegraphy, Acceptance (approval), Data transmission, Communication equipment, Performance testing, Error detection, Noise (spurious signals), Test equipment, Accuracy, Telegraphy, Radio transmitters, Electrical testing, Mobile radio systems, Verification, Graphic representation, Circuits, Radiocommunication, Selective calling equipment