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 6320-01-108-5933
NSN 6110-01-451-2013
NSN 6620-00-203-9466
NSN 7035-01-173-0529
NSN 6320-01-624-0193
NSN 4140-01-038-4470
NSN 5920-01-357-8053
NSN 6650-01-237-4689
NSN 5990-01-517-7848
NSN 6610-00-168-2200
NSN 6645-00-601-6793
NSN 6135-00-708-0892