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 5925-01-163-3141
NSN 5905-01-204-9412
NSN 6220-00-061-1522
NSN 5895-01-167-6236
NSN 5975-00-185-5243
NSN 5925-00-150-1072
NSN 2925-00-172-9264
NSN 6110-00-432-7414
NSN 6145-01-343-9854
NSN 5915-01-052-7681
NSN 5999-00-138-7173
NSN 5965-00-583-4865