FIELD: radio measurement technology; part-by-part serviceability check of ring array channels phased out by using ring harmonic method. SUBSTANCE: array has first pattern-forming matrix whose inputs are connected to antenna array radiators, second pattern-forming matrix whose outputs are connected to signal inputs of microwave switch whose output, in its turn, is connected to receiver input, command device whose output is connected to control input of microwave switch, and well as check signal source built up of check signal generator and auxiliary antenna. Novelty is that antenna array is provided, in addition, with commutated phase shifters whose inputs are connected to outputs of first pattern-forming matrix and outputs, to inputs of second pattern-forming matrix, and control inputs, to additional input of command device. Newly introduced in check-up system are also oscilloscope and digital-to-analog converter whose input is connected to output of command device and output, to X-input of oscilloscope. Y-input of the latter is connected to receiver output. With commutated phase shifters set to zero, signal arrives at receiver input only from one radiator. With microwave oscillator changed over, oscilloscope screen displays signals coming in turn from all radiators. EFFECT: improved reliability of check results. 2 dwg, 1 tbl
