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 5930-00-815-9908
NSN 5935-01-065-1028
NSN 4140-00-009-3586
NSN 6610-01-433-2219
NSN 5935-00-833-7881
NSN 5960-00-572-7434
NSN 5975-01-267-4842
NSN 5950-01-627-4779
NSN 5835-00-350-3703
NSN 2925-01-364-7926
NSN 5925-01-232-0450
NSN 5985-01-447-4110