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 6650-00-483-2853
NSN 6645-01-361-4813
NSN 5985-01-080-9292
NSN 5925-00-265-5807
NSN 5996-01-122-6162
NSN 6110-01-479-5645
NSN 6220-00-489-1440
NSN 7035-01-145-5059
NSN 5895-01-441-9089
NSN 6650-01-521-2077
NSN 6135-01-390-1841
NSN 5965-01-580-7754