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 5950-01-380-7614
NSN 5950-00-249-1260
NSN 5835-01-502-9228
NSN 5945-00-487-7966
NSN 6320-01-610-3821
NSN 6320-01-050-1290
NSN 5855-01-145-8973
NSN 2925-00-054-3550
NSN 5998-01-445-5426
NSN 5905-00-661-0881
NSN 5835-01-274-1035
NSN 5965-01-160-7037