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 5835-01-599-1876
NSN 5975-01-411-0801
NSN 5985-01-599-9240
NSN 6130-01-112-0158
NSN 5895-01-389-6317
NSN 6150-00-125-8457
NSN 6645-01-164-7650
NSN 6620-01-231-9731
NSN 6650-01-496-2662
NSN 6145-01-181-6198
NSN 6320-00-379-4695
NSN 5960-01-064-0319