FIELD: radio measurements, possible use for controlling different UHF devices.
SUBSTANCE: differently from known device, for measuring amplitude-frequency and phase-frequency characteristics, band adjustable filter is additionally included in device, signal output of which is connected to one of inputs of bearing mixer, signal input of band adjustable filter is connected to moving contact of third switch, controlling in of band adjustable filter is connected to controlling block.
EFFECT: increased precision of measuring of phase-frequency characteristics of four-poles with frequency transformation.
2 dwg
