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 6130-00-758-7435
NSN 5905-01-360-3958
NSN 5998-00-432-2613
NSN 4140-00-081-6814
NSN 5905-01-501-7434
NSN 6645-01-060-3627
NSN 5965-01-504-2340
NSN 6320-01-119-3935
NSN 5925-01-253-0066
NSN 5910-00-924-2100
NSN 5905-01-592-6257
NSN 6650-01-605-2302