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 6620-00-980-3157
NSN 5925-00-120-9023
NSN 6620-00-904-2139
NSN 7035-00-902-8995
NSN 6620-01-341-5164
NSN 7035-01-644-7759
NSN 5950-00-107-7321
NSN 5930-01-062-1560
NSN 5985-01-452-6610
NSN 2925-00-529-8681
NSN 5905-01-430-2541
NSN 2925-00-794-5937