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 5950-00-959-5988
NSN 6220-01-109-7379
NSN 5835-01-359-2575
NSN 5975-01-524-0108
NSN 5835-01-062-2235
NSN 5855-01-481-3906
NSN 5960-00-412-1202
NSN 5945-01-222-0847
NSN 6135-01-205-5965
NSN 5950-01-062-9178
NSN 4140-01-110-5712
NSN 6145-01-535-6220