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 6130-01-640-9480
NSN 5835-01-370-4292
NSN 5996-00-236-7712
NSN 5945-01-500-2140
NSN 6610-00-487-9624
NSN 6145-01-423-8625
NSN 6610-01-118-5498
NSN 5910-01-408-9850
NSN 5945-00-518-5248
NSN 6645-01-336-5815
NSN 6150-00-377-8616
NSN 6135-01-630-2261