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 6105-01-152-8496
NSN 5996-01-301-1779
NSN 6645-01-104-6540
NSN 5910-01-019-1240
NSN 6150-01-228-5924
NSN 2925-01-114-8484
NSN 5915-01-292-6084
NSN 6145-01-177-6623
NSN 6150-01-400-4211
NSN 5910-01-555-3498
NSN 5990-01-100-1840
NSN 5960-01-648-1872