Switches signals for test and calibration of system equipment; 1 khz to 4000 mhz freq range; five rf input bands 10 khz to 500 mhz; 5 mhz reference freq; 0.2 msec to 99.9 msec video pulse; dc to 20 mhz external high freq; 5 khz to 500 mhz external low freq; 7 outputs; oper pwr rqmts 115 vac, 400 hz, three ph; o/a dims 19 in. Lg; 18 in. W; 5.25 in. H; rack mounted