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 5985-00-597-2966
NSN 2925-00-497-7808
NSN 5975-01-137-4378
NSN 6150-01-266-2264
NSN 5985-00-922-6219
NSN 5835-01-632-6627
NSN 5920-01-116-3576
NSN 5945-00-754-7276
NSN 5915-01-580-0308
NSN 5945-00-107-7334
NSN 5910-01-633-5265
NSN 5999-01-326-8293