DMX-2637.400MHZ DMX-26-38.000KHZ DMX-2638.000MHZ DMX-2638.400MHZ DMX-2640.000MHZ DMX-268.000MHZ DMX-26S DMX-26S 12.5PF 20PPM DMX-26S 32.768KHZ DMX-26S 32.768KHZ 12.5PF 20PPM