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 5996-00-588-7632
NSN 5925-01-134-2747
NSN 5855-01-152-0506
NSN 7035-01-566-0779
NSN 6110-00-238-6909
NSN 5910-01-206-4641
NSN 5990-01-352-5255
NSN 5950-01-088-8604
NSN 6150-00-812-1965
NSN 5910-00-923-1005
NSN 5996-01-495-4331
NSN 5965-01-324-6583