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 5935-01-384-2197
NSN 5930-01-123-8758
NSN 5905-00-861-7159
NSN 5960-01-442-9304
NSN 5999-01-571-4696
NSN 2925-01-327-3069
NSN 5996-01-478-9147
NSN 6150-01-139-2716
NSN 4140-00-050-8456
NSN 5950-01-534-2341
NSN 6135-00-862-5736
NSN 5905-01-576-6249