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 6150-01-143-7341
NSN 5999-01-461-7135
NSN 6145-00-138-4658
NSN 5950-00-860-0782
NSN 6130-00-571-4092
NSN 6105-00-458-2497
NSN 5895-00-637-2658
NSN 2925-01-357-2512
NSN 5855-00-688-9954
NSN 6240-01-123-4998
NSN 5950-00-965-9784
NSN 5975-01-033-6578