Everything about Reduced-carrier Transmission totally explained
Reduced-carrier transmission is an
amplitude modulation (AM)
transmission in which the
carrier wave level is reduced to reduce
wasted
electrical power.
Suppressed-carrier transmission is a special case in which the carrier level is reduced below that required for
demodulation by a normal
receiver.
Reduction of the carrier level permits higher
power levels in the
sidebands than would be possible with conventional AM transmission. Carrier power must be restored by the receiving
station to permit
demodulation, usually with a
beat frequency oscillator (BFO). Failing to match the original
frequency when receiving such a signal will cause a
heterodyne.
Suppressed carriers are often used for
single sideband (SSB)
transmissions, such as for
amateur radio on
shortwave.
International broadcasters agreed in
1985 to also use suppressed-carrier SSB entirely by
2015, though
IBOC and
IBAC digital radio (namely
Digital Radio Mondiale) seems likely to make this irrelevant
A double-sideband suppressed carrier (DSSC) from a
stereo generator is used as a
subcarrier to transmit
FM stereo.
Source: partly from
Federal Standard 1037C
See also
Carrier recovery.
Further Information
Get more info on 'Reduced-carrier Transmission'.
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