The Spectracom Model 8161 WWVB Receiver Oscillator is a complete frequency calibration system containing a receiver comparator and a high quality oven-controlled quartz frequency standard oscillator. This standard may be continuously monitored against the WWVB VLF carrier. A strip-chart recorder is built into the unit to provide a permanent record of frequency accuracy. External local oscillators and standards can be also compared against the 60 kHz WWVB signal. An optional built-in distribution amplifier sends the internal standard signal to a maximum of 25 remote stations so that each has its own time base traceable to NBS. The demodulated WWVB time code output is also available for synchronizing accurate clocks and other timekeeping equipment.