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 6685-01-559-8255
NSN 5915-01-026-2420
NSN 5855-01-180-5369
NSN 5905-00-585-5831
NSN 6645-01-481-9834
NSN 5990-01-607-9433
NSN 5895-01-003-9424
NSN 2925-01-016-0876
NSN 5905-01-327-6979
NSN 6145-01-011-0151
NSN 6220-00-111-3188
NSN 5945-01-026-1231