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 6650-01-458-7521
NSN 6685-01-439-9342
NSN 5950-00-702-5547
NSN 6650-00-618-9398
NSN 6110-01-062-0252
NSN 5895-00-404-9636
NSN 6110-01-451-8113
NSN 6150-01-145-4449
NSN 2925-00-278-9468
NSN 6320-00-242-3300
NSN 5998-00-426-0676
NSN 5975-01-209-4385