FIELD: radio engineering; single-channel superheterodyne radio receivers and multichannel radio receiving systems whose heterodynes are, essentially, tunable frequency synthesizers. SUBSTANCE: device has N channels; first channel has series-connected interface unit, fixed-frequency reference signal generator and directional coupler, series-connected detector and analog-to-digital converter, and second interface unit whose first output and second input are connected, respectively, to first input and second output of first interface unit; input of analog-to-digital converter is connected to output of amplitude detector. All remaining channels are similar to first one; input of directional coupler functions as input of each channel; input and output of control unit are connected, respectively, to third output and second input of first interface unit of first channel; second output and third input of second interface unit of each channel except for last one are connected, respectively, to second input and third output of first interface unit of next channel; output of directional coupler in each channel is used for connecting input of channel radio receiver; input of amplitude detector is used for connecting output of channel radio receiver whose first and second control inputs are connected, respectively, to fourth output of first interface unit and to third output of second interface unit. EFFECT: facilitated independent automatic measurement of amplitude-frequency response of each of N channels of radio receiving system operating in microwave frequency range; improved measurement accuracy. 7 dwg
