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 5910-00-198-9779
NSN 5985-01-453-6886
NSN 5965-00-071-0562
NSN 5895-00-497-1160
NSN 5905-01-547-2422
NSN 6645-01-119-3496
NSN 5920-01-406-8567
NSN 6145-01-543-0124
NSN 5835-01-264-8782
NSN 5965-01-392-0049
NSN 4140-00-010-2986
NSN 5915-01-023-4882