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 5985-01-656-7480
NSN 5905-01-240-4012
NSN 6240-01-327-4945
NSN 6685-00-914-9771
NSN 6135-01-329-7994
NSN 6650-00-177-6390
NSN 6620-01-386-5543
NSN 6110-01-443-3039
NSN 5965-00-938-6271
NSN 5960-01-332-9695
NSN 5895-01-569-5344
NSN 6130-01-494-8371