Keithley Instruments has released a 4 x 4 multiple-input, multiple-output (MIMO) communications system test solution suitable for research and production environments. The MIMO RF test system consists of the company's model 2920 vector signal generator, model 2820 vector signal analyzer, model 2895 MIMO synchronization unit, and MIMO signal analysis software. The system provides within 2 ns signal sampler synchronization with less than 1 deg. of peak-to-peak RF carrier phase jitter. For more information on the 4 x 4 MIMO RF test solution, visit the Keithley Instruments site at