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 5996-00-089-0895
NSN 6220-00-917-0881
NSN 5999-01-043-5652
NSN 6150-01-227-2595
NSN 6240-00-435-7940
NSN 5920-00-806-3152
NSN 5999-00-288-5954
NSN 6610-00-681-0590
NSN 5920-01-529-1888
NSN 5930-01-088-7586
NSN 6105-00-955-9216
NSN 5998-01-361-8938