Goto Section: 2.1043 | 2.1047 | Table of Contents
Revised as of October 29, 2020
Goto Year:2020 |
§ 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 § 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
(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]
Goto Section: 2.1043 | 2.1047
Goto Year: 2020 |
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