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 5920-01-472-6923
NSN 7035-00-679-9027
NSN 6645-00-292-5053
NSN 6645-01-054-4423
NSN 5930-00-244-9530
NSN 6135-00-170-8819
NSN 4140-01-510-0423
NSN 5905-00-243-3937
NSN 7035-01-075-4832
NSN 5910-01-311-1277
NSN 7035-01-372-5006
NSN 5985-00-984-2009