STR-943-10-D1 is a doppler radar target simulator that operates at 94 GHz with a bandwidth of ±2 GHz and a WR-10 waveguide input/output. The simulator utilizes a single-sideband-modulator to modulate the incoming signal transmitted by the radar under test and sends back either a higher or lower band signal through a circulator. The frequency-shifted signal is transmitted back to the radar under test as a Doppler signal. Target characteristics are adjusted by changing the I and Q channel frequency and phase. Function Signal Generator STL-FG-000020-S1 is recommended. The routing attenuation is adjusted by the direct reading attenuator.