Sec. 74.970  Modulation limits.

    (a) Visual transmitter. The maximum excursion of the luminance 
signal in the white direction shall not exceed the value specified in 
Sec. 73.682(a)(13) of this chapter for the reference white level.
    (b) Aural transmitter. The maximum frequency deviation of the aural 
carrier shall not be permitted to exceed &177; 75 kHz on peaks of 
frequent recurrence during any transmission. This is defined as 100% 
modulation.

[ 28 FR 13731 , Dec. 14, 1963, as amended at  49 FR 32596 , Aug. 15, 1984]