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 6610-01-370-3886
NSN 5910-00-371-9915
NSN 6145-01-445-7167
NSN 6610-00-443-2980
NSN 5975-00-099-9312
NSN 5996-01-517-8409
NSN 6620-01-133-4193
NSN 6130-01-421-2705
NSN 6145-01-006-2845
NSN 7035-01-519-8227
NSN 6135-01-079-7852
NSN 5945-00-739-2202