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 5985-01-234-3965
NSN 6650-01-058-5908
NSN 5925-01-008-4732
NSN 6110-01-311-6800
NSN 5950-01-536-4797
NSN 6645-01-519-2220
NSN 6220-01-522-2729
NSN 6220-01-401-5337
NSN 5996-01-472-3670
NSN 6135-01-573-7164
NSN 6110-01-386-3093
NSN 5925-01-477-8316