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 6150-00-226-1868
NSN 6110-01-545-8654
NSN 4140-01-082-8604
NSN 6240-01-463-1169
NSN 7035-00-548-4098
NSN 6645-01-168-8465
NSN 5945-00-677-1358
NSN 7035-00-679-9027
NSN 6150-01-182-4675
NSN 5895-01-305-4226
NSN 5925-01-031-7381
NSN 5975-00-185-5243