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 6130-00-891-8800
NSN 5925-00-186-8669
NSN 5915-01-274-1411
NSN 5950-01-024-8546
NSN 6645-00-300-0401
NSN 6135-01-365-2707
NSN 5945-01-330-1616
NSN 5960-00-005-7132
NSN 5960-01-100-7381
NSN 5925-00-248-5734
NSN 5930-00-764-4687
NSN 5835-01-351-3425