Sec.  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  Sec. 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]