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 6645-01-492-4476
NSN 5915-00-998-4573
NSN 5985-01-451-4309
NSN 5960-01-179-4009
NSN 5835-00-864-4481
NSN 5990-00-104-4903
NSN 5996-01-081-6809
NSN 6130-01-538-5826
NSN 5975-01-246-6936
NSN 5996-00-889-7101
NSN 5920-01-605-2457
NSN 5990-01-609-4793