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 6150-01-014-5691
NSN 6650-01-560-2861
NSN 5930-00-589-7628
NSN 4140-01-378-6710
NSN 2925-01-025-0082
NSN 5920-00-902-4041
NSN 5985-01-154-2027
NSN 6650-00-764-4136
NSN 5935-01-645-9521
NSN 6220-01-438-2642
NSN 5996-00-428-3929
NSN 7035-01-584-1350