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 5910-01-053-2885
NSN 6130-00-239-0230
NSN 5950-01-126-8270
NSN 6610-01-538-4660
NSN 5960-01-118-3394
NSN 5925-00-932-3027
NSN 5915-01-196-4787
NSN 5960-01-580-6360
NSN 5945-00-827-0165
NSN 6105-00-087-7690
NSN 6685-01-093-9778
NSN 6220-01-618-6408