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 5945-00-666-4700
NSN 4140-00-103-2449
NSN 5975-01-294-7415
NSN 5960-01-267-6139
NSN 6240-01-647-6751
NSN 6150-00-666-3635
NSN 5975-00-768-8910
NSN 5835-01-332-2867
NSN 5920-00-102-8713
NSN 5975-01-283-6244
NSN 6130-01-214-9934
NSN 6650-01-608-8010