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 5835-01-376-8454
NSN 5855-01-593-3985
NSN 6650-00-078-5773
NSN 5998-01-519-3236
NSN 6685-00-720-3525
NSN 6130-01-327-2160
NSN 5915-00-128-8808
NSN 5920-01-368-6129
NSN 4140-01-599-1607
NSN 6220-00-193-7278
NSN 6135-00-170-8819
NSN 6135-00-276-7625