is in some cases considered beneficial and is one reason that the aviation industry, and others, have chosen to use AM rather than FM for communications. Phenomena similar 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 glideslope vertical guidance clearance beam is sometimes described as a "capture effect" system, even though it operates using AM signals. Digital modulation For digital modulation schemes it has been shown that for properly implemented on-off keying/amplitude-shift keying systems, co-channel rejection can be better than for frequency-shift keying systems. See also Near–far problem Notes References External links FM Limiter & Capture Ratio, by Dietmar Rudolph Radio Broadcast engineering