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 5999-00-469-1052
NSN 5999-00-014-6587
NSN 5950-01-340-9151
NSN 6320-01-585-8468
NSN 5950-00-290-8090
NSN 7035-00-884-8366
NSN 5855-00-125-0780
NSN 6135-01-111-1495
NSN 6110-00-934-7943
NSN 5945-01-381-2038
NSN 6110-00-188-9874
NSN 6135-01-315-7888