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 6620-01-541-4465
NSN 6110-01-348-9740
NSN 5915-00-168-4549
NSN 6240-01-410-8958
NSN 5925-01-613-9807
NSN 6135-01-295-8315
NSN 6145-01-414-1493
NSN 6650-01-137-7450
NSN 5935-00-104-7528
NSN 5930-01-425-1206
NSN 5990-01-497-2138
NSN 5910-01-323-7086