FCC 101.811 Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 101.811 Modulation requirements.
(a) The use of modulating frequencies higher than 3000 hertz for single
channel radiotelephony or tone signaling on frequencies below 500 MHz is not
authorized.
(b) When amplitude modulation is used, the modulation percentage must be
sufficient to provide efficient communication and must normally be
maintained above 70 percent on positive peaks, but may not exceed 100
percent on negative peaks.
(c) When phase or frequency modulation is used for single channel
radiotelephony on frequencies below 500 MHz, the deviation arising from
modulation may not exceed plus or minus 15 kHz from the unmodulated carrier.
(d) Each unmultiplexed radiotelephone transmitter having more than 3 watts
plate power input to the final radio frequency stage and initially installed
at the station in this service after September 4, 1956, must be provided
with a device that will automatically prevent modulation in excess of that
specified in paragraphs (b) and (c) of this section which may be caused by
greater than normal audio level.
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