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 5975-00-102-9639
NSN 5996-01-520-8412
NSN 6240-00-403-9849
NSN 5985-01-386-9846
NSN 4140-01-321-9085
NSN 5895-01-627-0909
NSN
NSN 6685-00-736-8490
NSN 4140-00-435-5607
NSN 5920-00-156-9230
NSN 6150-01-104-4323
NSN 6320-01-029-4220