The ESE LX-221 is a six output Black-Burst / Sync Generator. The unit features enhanced black-burst circuitry and extremely precise stability. The LX-221 provides a convenient source of RS-170A composite black-burst for pre-blacking tapes or for synchronization purposes. The unit may be genlocked to an external source of video or operate in stand-alone mode. In stand-alone mode the unit references an internal voltage-controlled, temperature compensated crystal oscillator. If the signal is lost when operating in genlock mode, the unit automatically references the internal crystal.