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 6145-00-264-0165
NSN 6135-00-577-8429
NSN 2925-01-497-9381
NSN 5985-01-200-6830
NSN 5960-00-279-3536
NSN 5920-00-058-7316
NSN 6130-01-381-6381
NSN 5910-01-514-6990
NSN 5895-01-211-6807
NSN 5915-00-553-8755
NSN 6105-00-197-2128
NSN 5920-00-187-0260