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 5945-01-321-9981
NSN 6150-01-498-3339
NSN 2925-00-233-5644
NSN 6240-01-511-9778
NSN 5895-00-572-3831
NSN 6145-00-657-4755
NSN 5935-01-250-8919
NSN 7035-00-541-8516
NSN 5855-01-300-7424
NSN 5990-00-728-8248
NSN 5975-01-358-4313
NSN 2925-00-468-5273