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 2925-00-101-7972
NSN 5930-00-386-5963
NSN 5998-01-532-8110
NSN 6620-00-280-2874
NSN 6645-01-121-6952
NSN 6150-01-446-2500
NSN 7035-00-093-5840
NSN 5996-00-705-4972
NSN 5975-00-080-7575
NSN 6145-01-211-6135
NSN 6135-00-660-8654
NSN 5945-01-507-8706