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 5950-01-033-0688
NSN 5945-01-065-3710
NSN 5999-01-610-9506
NSN 5945-01-469-6443
NSN 6105-01-423-2784
NSN 5975-01-580-1874
NSN 5835-00-111-2953
NSN 5950-00-328-9895
NSN 5915-01-542-8722
NSN 5960-01-255-5580
NSN 6685-01-332-3855
NSN 5950-00-864-8149