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- Anomalous propagation (sometimes shortened to anaprop or anoprop) includes different forms of radio propagation due to an unusual distribution of temperature and humidity with height in the atmosphere. While this includes propagation with larger losses than in a standard atmosphere, in practical applications it is most often meant to refer to cases when signal propagates beyond normal radio horizon. Anomalous propagation can cause interference to VHF and UHF radio communications if distant stations are using the same frequency as local services. Over-the-air analog television broadcasting, for example, may be disrupted by distant stations on the same channel, or experience distortion of transmitted signals ghosting). Radar systems may produce inaccurate ranges or bearings to distant targets if the radar "beam" is bent by propagation effects. However, radio hobbyists take advantage of these effects in TV and FM DX. (en)
- La propagation anormale est la transmission des ondes électromagnétiques dans l'atmosphère terrestre quand l'énergie est réfractée selon une trajectoire autre que celle normale par des discontinuités de densité à un ou plusieurs niveaux de l'atmosphère terrestre. Elle résulte d'une distribution verticale inhabituelle de la température et de l'humidité. Elle est la cause des mirages, de problèmes de télécommunications et de faux échos sur les radars. (fr)
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- La propagation anormale est la transmission des ondes électromagnétiques dans l'atmosphère terrestre quand l'énergie est réfractée selon une trajectoire autre que celle normale par des discontinuités de densité à un ou plusieurs niveaux de l'atmosphère terrestre. Elle résulte d'une distribution verticale inhabituelle de la température et de l'humidité. Elle est la cause des mirages, de problèmes de télécommunications et de faux échos sur les radars. (fr)
- Anomalous propagation (sometimes shortened to anaprop or anoprop) includes different forms of radio propagation due to an unusual distribution of temperature and humidity with height in the atmosphere. While this includes propagation with larger losses than in a standard atmosphere, in practical applications it is most often meant to refer to cases when signal propagates beyond normal radio horizon. (en)
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- Anomalous propagation (en)
- Propagation anormale (fr)
- 外聴域 (ja)
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