An item that can generate a fundamental frequency with a high degree of accuracy. Harmonics of this fundamental are then used as a reference point for checking throughout the radio spectrum. The standard may be stable crystal oscillator, noncrystal oscillator, tuning fork, atomic beam, molecular beam, gas cell, quantum mechanical resonator, or the like.
Classification: Parts and accessories of articles of schedule b subheading 9030.39
NSN 6320-01-576-6310
NSN 5985-01-633-6782
NSN 5835-01-149-6855
NSN 5920-00-879-8654
NSN 5915-00-336-6481
NSN 4140-00-078-9357
NSN 5985-01-324-6447
NSN 6610-01-091-2908
NSN 5910-00-692-7865
NSN 5915-01-398-0633
NSN 5990-00-965-9611
NSN 5950-01-309-9802