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 6220-00-371-7589
NSN 5960-01-589-6846
NSN 5999-01-113-0024
NSN 6240-01-467-0751
NSN 5930-00-399-3237
NSN 5960-01-528-1147
NSN 6145-00-369-3880
NSN 5985-01-291-4278
NSN 6645-00-609-7214
NSN 6110-01-204-1270
NSN 6650-01-467-8818
NSN 6320-01-631-7828