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 5950-00-048-3412
NSN 5925-01-265-7749
NSN 6645-01-199-0062
NSN 5920-01-581-3068
NSN 5855-01-122-9418
NSN 5985-01-538-5425
NSN 6320-01-125-3361
NSN 5960-01-350-2925
NSN 6685-00-019-7558
NSN 4140-01-294-8241
NSN 6145-01-364-4853
NSN 6685-00-991-8150