A false Doppler shift is imparted on a received signal for confusing or disrupting the effective functioning of enemy fire control or target tracking signals. A radar repeater having a pair of antennae with associated amplifiers has both antennae visible to a remote radar. A frequency changer is interposed between the antennae for creating a shift in frequency that is to be returned to the enemy. The frequency changer can be either of the mechanical or electronic variety. A mechanical version utilizes a rotary probe driven by a reversible variable speed drive. An electronic version utilizes a sequence of electronic gates controlled by an electronic logic device under the control of a master oscillator.
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