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 5920-00-960-7614
NSN 5975-01-288-1059
NSN 5998-00-516-4111
NSN 6610-01-030-6462
NSN 5990-00-336-2054
NSN 5905-01-407-5528
NSN 5915-01-492-1913
NSN 5950-01-354-7985
NSN 5835-00-752-6065
NSN 5910-00-927-5741
NSN 4140-00-142-2203
NSN 6135-01-091-6021