Sec.  2.1046   Measurements required: RF power output.

   (a) For transmitters other than single sideband, independent sideband and
   controlled carrier radiotelephone, power output shall be measured at the RF
   output terminals when the transmitter is adjusted in accordance with the
   tune-up procedure to give the values of current and voltage on the circuit
   elements specified in  Sec. 2.1033(c)(8). The electrical characteristics of the
   radio frequency load attached to the output terminals when this test is made
   shall be stated.

   (b)  For  single  sideband,  independent sideband, and single channel,
   controlled carrier radiotelephone transmitters the procedure specified in
   paragraph  (a) of this section shall be employed and, in addition, the
   transmitter shall be modulated during the test as follows. In all tests, the
   input level of the modulating signal shall be such as to develop rated peak
   envelope power or carrier power, as appropriate, for the transmitter.

   (1) Single sideband transmitters in the A3A or A3J emission modes—by two
   tones  at  frequencies  of  400 Hz and 1800 Hz (for 3.0 kHz authorized
   bandwidth), or 500 Hz and 2100 Hz (3.5 kHz authorized bandwidth), or 500 Hz
   and 2400 Hz (for 4.0 kHz authorized bandwidth), applied simultaneously, the
   input levels of the tones so adjusted that the two principal frequency
   components of the radio frequency signal produced are equal in magnitude.

   (2) Single sideband transmitters in the A3H emission mode—by one tone at a
   frequency of 1500 Hz (for 3.0 kHz authorized bandwidth), or 1700 Hz (for 3.5
   kHz authorized bandwidth), or 1900 Hz (for 4.0 kHz authorized bandwidth),
   the level of which is adjusted to produce a radio frequency signal component
   equal in magnitude to the magnitude of the carrier in this mode.

   (3) As an alternative to paragraphs (b) (1) and (2) of this section other
   tones besides those specified may be used as modulating frequencies, upon a
   sufficient  showing  of need. However, any tones so chosen must not be
   harmonically related, the third and fifth order intermodulation products
   which occur must fall within the −25 dB step of the emission bandwidth
   limitation curve, the seventh and ninth order intermodulation product must
   fall within the 35 dB step of the referenced curve and the eleventh and all
   higher order products must fall beyond the −35 dB step of the referenced
   curve.

   (4) Independent sideband transmitters having two channels by 1700 Hz tones
   applied simultaneously in both channels, the input levels of the tones so
   adjusted that the two principal frequency components of the radio frequency
   signal produced are equal in magnitude.

   (5) Independent sideband transmitters having more than two channels by an
   appropriate signal or signals applied to all channels simultaneously. The
   input signal or signals shall simulate the input signals specified by the
   manufacturer for normal operation.

   (6)  Single-channel controlled-carrier transmitters in the A3 emission
   mode—by a 2500 Hz tone.

   (c) For measurements conducted pursuant to paragraphs (a) and (b) of this
   section, all calculations and methods used by the applicant for determining
   carrier  power or peak envelope power, as appropriate, on the basis of
   measured power in the radio frequency load attached to the transmitter
   output terminals shall be shown. Under the test conditions specified, no
   components of the emission spectrum shall exceed the limits specified in the
   applicable  rule  parts as necessary for meeting occupied bandwidth or
   emission limitations.

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