Sec. 2.997  Frequency spectrum to be investigated.

    (a) In all of the measurements set forth in Secs. 2.991 and 2.993, 
the spectrum shall be investigated from the lowest radio frequency 
signal generated in the equipment, without going below 9 kHz, up to at 
least the frequency shown below:
    (1) If the equipment operates below 10 GHz: to the tenth harmonic of 
the highest fundamental frequency or to 40 GHz, whichever is lower.
    (2) If the equipment operates at or above 10 GHz and below 30 GHz: 
to the fifth harmonic of the highest fundamental frequency or to 100 
GHz, whichever is lower.
    (3) If the equipment operates at or above 30 GHz: to the fifth 
harmonic of the highest fundamental frequency or to 200 GHz, whichever 
is lower.
    (b) Particular attention should be paid to harmonics and 
subharmonics of the carrier frequency as well as to those frequencies 
removed from the carrier by multiples of the oscillator frequency. 
Radiation at the frequencies of multiplier stages should also be 
checked.
    (c) The amplitude of spurious emissions which are attenuated more 
than 20 dB below the permissible value need not be reported.
    (d) Unless otherwise specified, measurements above 40 GHz shall be 
performed using a minimum resolution bandwidth of 1 MHz.
[ 61 FR 14502 , Apr. 2, 1996]