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 5895-00-895-4446
NSN 2925-00-816-8765
NSN 5935-01-182-6804
NSN 4140-01-161-1048
NSN 7035-00-104-7613
NSN 5935-01-506-2257
NSN 5985-00-218-1356
NSN 5935-01-007-6646
NSN 6135-01-051-7836
NSN 5910-01-617-0341
NSN 4140-01-218-4999
NSN 6650-01-359-1770