47 CFR Ch. I (10–1–09 Edition)

§ 2.1047 47 CFR Ch. I (10–1–09 Edition)

so adjusted that the two principal fre- the peak envelope power output versus quency components of the radio fre- the modulation input voltage shall be quency signal produced are equal in supplied. The modulating signals shall magnitude. be the same in frequency as specified in (5) Independent sideband transmit- paragraph (c) of § 2.1049 for the occupied ters having more than two channels by bandwidth tests. an appropriate signal or signals applied (d) Other types of equipment. A curve to all channels simultaneously. The or equivalent data which shows that input signal or signals shall simulate the equipment will meet the modula- the input signals specified by the man- tion requirements of the rules under ufacturer for normal operation. which the equipment is to be licensed. (6) Single-channel controlled-carrier [39 FR 5919, Feb. 15, 1974. Redesignated and transmitters in the A3 emission mode— amended at 63 FR 36599, July 7, 1998] by a 2500 Hz tone. (c) For measurements conducted pur- § 2.1049 Measurements required: Occu- suant to paragraphs (a) and (b) of this pied bandwidth. section, all calculations and methods The occupied bandwidth, that is the used by the applicant for determining frequency bandwidth such that, below carrier power or peak envelope power, its lower and above its upper frequency as appropriate, on the basis of meas- limits, the mean powers radiated are ured power in the radio frequency load each equal to 0.5 percent of the total attached to the transmitter output ter- mean power radiated by a given emis- minals shall be shown. Under the test sion shall be measured under the fol- conditions specified, no components of lowing conditions as applicable: the emission spectrum shall exceed the (a) Radiotelegraph transmitters for limits specified in the applicable rule manual operation when keyed at 16 parts as necessary for meeting occu- dots per second. pied bandwidth or emission limita- (b) Other keyed transmitters—when tions. keyed at the maximum machine speed. [39 FR 5919, Feb. 15, 1974. Redesignated and (c) Radiotelephone transmitters amended at 63 FR 36599, July 7, 1998] equipped with a device to limit modulation or peak envelope power shall be § 2.1047 Measurements required: Mod- modulated as follows. For single side- ulation characteristics. band and independent sideband trans- (a) Voice modulated communication mitters, the input level of the modu- equipment. A curve or equivalent data lating signal shall be 10 dB greater showing the frequency response of the than that necessary to produce rated audio modulating circuit over a range peak envelope power. of 100 to 5000 Hz shall be submitted. For (1) Other than single sideband or equipment required to have an audio independent sideband transmitters— low-pass filter, a curve showing the fre- when modulated by a 2500 Hz tone at an quency response of the filter, or of all input level 16 dB greater than that nec- circuitry installed between the modu- essary to produce 50 percent modula- lation limiter and the modulated stage tion. The input level shall be estab- shall be submitted. lished at the frequency of maximum re- (b) Equipment which employs modula- sponse of the audio modulating circuit. tion limiting. A curve or family of (2) Single sideband transmitters in curves showing the percentage of mod- A3A or A3J emission modes—when ulation versus the modulation input modulated by two tones at frequencies voltage shall be supplied. The informa- of 400 Hz and 1800 Hz (for 3.0 kHz au- tion submitted shall be sufficient to thorized bandwidth), or 500 Hz and 2100 show modulation limiting capability Hz (for 3.5 kHz authorized bandwidth), throughout the range of modulating or 500 Hz and 2400 Hz (for 4.0 kHz au- frequencies and input modulating sig- thorized bandwidth), applied simulta- nal levels employed. neously. The input levels of the tones (c) Single sideband and independent shall be so adjusted that the two prin- sideband radiotelephone transmitters cipal frequency components of the which employ a device or circuit to limit radio frequency signal produced are peak envelope power. A curve showing equal in magnitude.

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