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 5855-01-290-2786
NSN 5925-01-380-9778
NSN 6150-01-111-7786
NSN 5950-00-465-6936
NSN 6105-01-442-3338
NSN 5910-01-534-5054
NSN 5985-01-451-9103
NSN 6240-00-252-7695
NSN 6240-01-293-9068
NSN 2925-01-020-5099
NSN 6620-00-155-2608
NSN 5985-00-967-0476