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 7035-01-086-2922
NSN 6685-01-335-7587
NSN 6150-01-463-5072
NSN 6620-01-424-6925
NSN 5925-00-423-2791
NSN 6645-01-519-3007
NSN 5920-01-602-9241
NSN 5935-01-595-6597
NSN 6105-00-542-7948
NSN 5910-01-446-1751
NSN 5999-01-460-4689
NSN 5905-01-047-7796