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 6150-01-188-1518
NSN 5975-01-176-5620
NSN 5835-01-250-2939
NSN 5925-00-960-5214
NSN 5985-01-245-8533
NSN 5925-00-961-1202
NSN 5910-01-167-8593
NSN 5835-01-470-7700
NSN 6685-00-108-1108
NSN 5998-00-554-4483
NSN 5996-01-145-4900
NSN 5950-01-368-6075