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 5998-01-099-6498
NSN 6135-01-650-6529
NSN 5895-01-403-2793
NSN 5935-00-539-5944
NSN 5895-00-258-9135
NSN 6145-01-625-4874
NSN 2925-01-037-5383
NSN 6650-01-382-8569
NSN 7035-01-260-0804
NSN 5945-01-617-0405
NSN 5996-01-105-7385
NSN 6650-01-371-5886