§  2.1047   Measurements required: Modulation characteristics.

   (a) Voice modulated communication equipment. A curve or equivalent data
   showing the frequency response of the audio modulating circuit over a
   range of 100 to 5000 Hz shall be submitted. For equipment required to
   have an audio low-pass filter, a curve showing the frequency response
   of the filter, or of all circuitry installed between the modulation
   limiter and the modulated stage shall be submitted.

   (b) Equipment which employs modulation limiting. A curve or family of
   curves showing the percentage of modulation versus the modulation input
   voltage shall be supplied. The information submitted shall be
   sufficient to show modulation limiting capability throughout the range
   of modulating frequencies and input modulating signal levels employed.

   (c) Single sideband and independent sideband radiotelephone
   transmitters which employ a device or circuit to limit peak envelope
   power. A curve showing the peak envelope power output versus the
   modulation input voltage shall be supplied. The modulating signals
   shall be the same in frequency as specified in paragraph (c) of
   § 2.1049 for the occupied bandwidth tests.

   (d) Other types of equipment. A curve or equivalent data which shows
   that the equipment will meet the modulation requirements of the rules
   under which the equipment is to be licensed.

   [ 39 FR 5919 , Feb. 15, 1974. Redesignated and amended at  63 FR 36599 ,
   July 7, 1998]