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 5935-01-051-4432
NSN 5998-00-372-6047
NSN 5855-01-419-5285
NSN 5915-01-519-3287
NSN 5895-01-449-5804
NSN 6135-00-321-6707
NSN 5920-01-466-3162
NSN 5950-01-634-0677
NSN 5910-01-510-7245
NSN 5996-01-475-3592
NSN 5835-00-787-8122
NSN 5990-00-713-9016