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 5930-01-282-6822
NSN 6320-01-353-9753
NSN 5998-01-078-3403
NSN 5965-01-577-0565
NSN 5910-00-808-3223
NSN 5960-01-449-5726
NSN 5999-01-232-4886
NSN 5910-01-179-7876
NSN 5965-01-581-2164
NSN 5895-01-184-1036
NSN 5975-01-644-9680
NSN 5895-01-122-5582