Radio Communications Test Set type 2955 combines ail the measurement facilities ^required for testing mobile radio transceivers in the range up to 1000 MHz. It is a compact self-contained unit designed for bench or mobile use and can be considered as a combination of, eleven instruments as follows:- RF counter u AF counter. RF signal generator. Modulation meter. RF power meter. AF generator. ‘ AF and DC voltmeter. Distortion meter. S/N (signal to noise) and SIN AD (S/N and distortion) meter. Tones decoder and encoder. Digital oscilloscope. Push-button selection makes ail the necessary interconnections for each measure- ment, eliminating the need for the many interconnections required when separate instruments are used. Function .selection and data entries are made on a colour-coded keyboard with the operating sequence logically arranged from left to i'.^nt. instrument operation is greatly enhanced by the CRT display which provides prompts during data entry and guidance during operating sequences while also showing the instrument settings and measurement results. Analogue measurements are displayed by an oscilloscope with repetitive sweep, single shot and freeze facilities, as weil as by five autoranging bar chans.