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 5935-01-277-5659
NSN 6135-01-159-3032
NSN 6220-01-359-8322
NSN 5915-01-391-0136
NSN 6645-00-847-3727
NSN 5990-01-300-7801
NSN 5835-01-250-2939
NSN 5855-01-398-2990
NSN 6220-01-265-2705
NSN 6110-01-504-7860
NSN 5930-01-650-6572
NSN 6105-01-473-5166