The RCS/ISAR Measurement Interface contains additional RF circuitry that allows RCS and ISAR measurements to be performed using the Basic Radar Training System. This RF circuitry also allows the Basic Radar Training System to be converted into a synthetic aperture radar (SAR). The additional RF circuitry in the RCS/ISAR Measurement Interface consists of a time-gated, variable-gain amplifier; a circulator; and two limiters. The time-gated, variable-gain amplifier increases the peak RF power transmitted. It also maintains the average RF power transmitted to a level that allows the system to be operated safely in a classroom laboratory. The circulator is used for simultaneous transmission and reception using the same antenna. The limiters prevent saturation in the I and Q channels of the receiving section of the system (i.e., the Radar Receiver and the Dual-Channel Sampler).

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