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 5925-00-156-4044
NSN 5965-00-434-7617
NSN 5998-01-375-2588
NSN 5910-01-221-2314
NSN 6135-01-366-9633
NSN 5945-01-251-1196
NSN 5835-01-524-4731
NSN 5996-00-170-8060
NSN 6150-00-551-3135
NSN 7035-01-576-9617
NSN 5999-00-491-6750
NSN 5950-01-400-5942