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 5999-01-449-0875
NSN 5990-00-840-6571
NSN 5965-00-289-6280
NSN 5935-00-238-7428
NSN 6685-00-276-9889
NSN 6150-00-804-7015
NSN 5905-01-634-0595
NSN 6645-01-633-1852
NSN 5985-01-392-1188
NSN 5996-01-175-4838
NSN 5985-01-421-1517
NSN 7035-01-027-1718