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 6135-00-134-6648
NSN 5996-01-359-8719
NSN 5905-01-608-7010
NSN 6135-01-247-5660
NSN 7035-00-371-7749
NSN 6135-00-613-1068
NSN 5855-01-411-3360
NSN 7035-01-193-2667
NSN 6240-01-122-1636
NSN 5910-01-423-8985
NSN 6645-01-633-1852
NSN 5996-00-960-9494