FCC 95.637 Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 95.637 Modulation standards.
(a) A GMRS transmitter that transmits emission types F1D, G1D, or G3E must
not exceed a peak frequency deviation of plus or minus 5 kHz. A GMRS
transmitter that transmits emission type F3E must not exceed a peak
frequency deviation of plus or minus 5 kHz. A FRS unit that transmits
emission type F3E must not exceed a peak frequency deviation of plus or
minus 2.5 kHz, and the audio frequency response must not exceed 3.125 kHz .
(b) Each GMRS transmitter, except a mobile station transmitter with a power
output of 2.5 W or less, must automatically prevent a greater than normal
audio level from causing overmodulation. The transmitter also must include
audio frequency low pass filtering, unless it complies with the applicable
paragraphs of Sec. 95.631 (without filtering.) The filter must be between the
modulation limiter and the modulated stage of the transmitter. At any
frequency (f in kHz) between 3 and 20 kHz, the filter must have an
attenuation of at least 60 log[10] (f/3) dB greater than the attenuation at
1 kHz. Above 20 kHz, it must have an attenuation of at least 50 dB greater
than the attenuation at 1 kHz.
(c) When emission type A3E is transmitted, the modulation must be greater
than 85% but must not exceed 100%. Simultaneous amplitude modulation and
frequency or phase modulation of a transmitter are not permitted.
(d) When emission type A3E is transmitted by a CB transmitter having a TP of
greater than 2.5 W, the CB transmitter must automatically prevent the
modulation from exceeding 100%.
(e) Each CB transmitter that transmits emission type H3E, J3E or R3E must be
capable of transmitting the upper sideband. The capability of also
transmitting the lower sideband is permitted.
(f) DSRCS-OBUs are governed under subpart L of this part.
[ 53 FR 36789 , Sept. 22, 1988. Redesignated and amended at 61 FR 28769 ,
28770, June 6, 1996, and further redesignated at 61 FR 46567 , Sept. 4, 1996;
69 FR 46446 , Aug. 3, 2004]
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