- Capture effect
telecommunication, the capture effect, or FMcapture effect, is a phenomenon associated with FM reception in which only the stronger of two signals at, or near, the same frequencywill 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 is not amplified, but attenuated. When both signals are nearly equal in strength, or are fadingindependently, the receiver may switchfrom one to the other and exhibit picket fencing.
Amplitude Modulation, or AM
radio, transmissionis not 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. Similar phenomena to the capture effect are described in AM when offset carriers of different strengths are present in the passband of a receiver. For example, the aviation glideslopevertical guidance clearance beam is sometimes described as a "capture effect" system, even though it operates using AM signals.
Notes and References
Federal Standard 1037Cand from MIL-STD-188
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