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 5999-01-525-9156
NSN 6610-01-579-2984
NSN 5960-01-419-9156
NSN 6240-01-441-2765
NSN 5998-01-135-5215
NSN 6220-01-201-6161
NSN 5945-00-145-6088
NSN 5999-01-246-4667
NSN 5990-00-998-6193
NSN 5835-01-067-7770
NSN 5920-01-246-0706
NSN 5855-01-604-0801