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 5905-01-609-3219
NSN 5960-01-138-0684
NSN 5999-01-536-9669
NSN 5950-01-071-4662
NSN 6320-01-445-5893
NSN 5895-00-381-9712
NSN 5855-01-566-3186
NSN 5935-00-926-3099
NSN 6650-00-724-8258
NSN 6130-00-882-1874
NSN 5960-01-491-2993
NSN 5920-01-361-7812