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 6240-01-267-6499
NSN 5998-01-345-7108
NSN 5935-00-938-8568
NSN 6135-01-529-0122
NSN 5835-00-155-1379
NSN 5935-01-469-3936
NSN 6110-01-118-7794
NSN 5985-00-650-0504
NSN 6240-01-152-1084
NSN 6320-01-054-3046
NSN 6150-01-074-8354
NSN 5835-01-103-1384