Sec. 2.985  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. 2.983(d)(5). 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.

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