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 5996-00-067-5219
NSN 6620-01-546-4942
NSN 5925-00-439-4025
NSN 5985-01-660-3257
NSN 6110-01-333-7923
NSN 5925-01-577-9239
NSN 6620-00-221-7608
NSN 6105-00-450-7657
NSN 4140-01-312-1584
NSN 5950-00-610-6144
NSN 6610-01-141-9979
NSN 5855-01-169-9228