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 5920-00-615-8897
NSN 6620-01-526-2857
NSN 5990-01-571-7468
NSN 6220-01-232-9947
NSN 6105-01-415-9351
NSN 5915-01-456-2374
NSN 6320-01-134-7267
NSN 6105-00-173-4073
NSN 5975-00-272-2913
NSN 6135-00-973-5632
NSN 6650-00-760-1385
NSN 5930-00-844-7597