Capture effect

In a radio receiver, the capture effect is a phenomenon associated with reception in which only the stronger of two or more signals received within the bandwidth of the receiver passband will be demodulated. The Capture effect therefore enables frequency reuse of the same frequency by imposing a sufficient distance separation, e.g. AM capture effect is used with AM communications in the AM(R)S (Aeronautical mobile (R) service), or between FM-BC transmitters for the FM capture effect. Alternatively, the capture effect enables two-frequency ILS-Localizer (ILS-LOC) and ILS-Glide-Path (ILS-GP) transmitters to operate at airports in presence of strong reflections, e.g. due to terrain and buildings.

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