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 5996-01-163-6773
NSN 6220-01-135-8711
NSN 5835-01-572-1284
NSN 6145-01-272-8976
NSN 7035-00-938-8289
NSN 5965-01-204-8505
NSN 5835-01-160-7282
NSN 4140-01-372-8925
NSN 6240-00-765-9458
NSN 5915-01-194-3652
NSN 5925-01-282-7751
NSN 6110-00-689-6313