Everything about Capture Effect totally explained
In
telecommunication, the
capture effect, or
FM capture effect, is a phenomenon associated with FM reception in which only the stronger of two signals at, or near, the same
frequency will be
demodulated.
The capture effect is defined as the complete suppression of the weaker signal at the
receiver limiter (if it has one) where the weaker signal isn't
amplified, but
attenuated. When both signals are nearly equal in strength, or are
fading independently, the receiver may
switch from one to the other and exhibit
picket fencing.
Amplitude Modulation, or
AM radio,
transmission isn't subject to this effect. This is one reason that the
aviation industry, and others, have chosen to use AM for communications rather than FM, allowing multiple signals to be
broadcast on the same channel.
For
digital modulation schemes it has been shown that for properly implemented
OOK/
ASK systems,
co-channel rejection can be better than for
FSK systems.
Notes and References
Source: from
Federal Standard 1037C and from
MIL-STD-188
Further Information
Get more info on 'Capture Effect'.
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