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 5975-01-264-0396
NSN 6220-01-542-4671
NSN 5930-00-271-2382
NSN 5905-01-038-2554
NSN 6145-01-099-0448
NSN 6105-00-186-9380
NSN 5960-00-759-1462
NSN 5985-01-346-6042
NSN 7035-00-252-7467
NSN 5905-01-184-0582
NSN 6105-01-401-5361
NSN 6685-01-518-7746