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 5915-00-542-2179
NSN 6620-01-483-1138
NSN 5998-00-027-4173
NSN 5835-01-005-8564
NSN 5945-01-324-6751
NSN 6105-01-606-4265
NSN 6220-00-610-0968
NSN 4140-01-528-4457
NSN 5930-01-633-9121
NSN 6645-01-305-9135
NSN 5999-01-441-9732
NSN 5910-01-482-8640