Goto Section: 101.809 | 101.813 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 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
(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.
Goto Section: 101.809 | 101.813
Goto Year: 2020 |
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