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 6220-01-064-8535
NSN 7035-00-902-8995
NSN 5996-01-052-4027
NSN 5996-00-826-8837
NSN 5895-01-072-0233
NSN 5895-00-435-5955
NSN 5905-01-487-7452
NSN 4140-01-629-6548
NSN 5855-01-406-9451
NSN 6620-00-819-5046
NSN 5950-01-190-4759
NSN 6150-01-202-5512