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 5950-01-346-8687
NSN 5999-00-085-3983
NSN 5965-01-205-3088
NSN 5998-00-554-8269
NSN 6610-01-361-5784
NSN 6105-00-955-2073
NSN 6130-01-378-6778
NSN 5945-00-615-6778
NSN 5998-01-395-9422
NSN 5998-00-112-4956
NSN 6650-01-110-2142
NSN 5895-01-113-7725