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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

An antenna with a high-resolution beam pattern that measures the angle between local direction references and an astronomical radio signal source such as an artificial satellite, the sun, the moon, or a radio star.  1, record 1, English, - radio%20sextant

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Instrument permettant la mesure de la hauteur des corps célestes au-dessus de l'horizon et utilisant non pas le rayonnement lumineux de ces corps célestes, mais leur rayonnement radio(électrique).  2, record 1, French, - radiosextant

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

Layer of the ionosphere exhibiting one or several maxima of electron density, at about 110 km.  6, record 2, English, - E%20layer

Record number: 2, Textual support number: 1 CONT

The ionosphere is usually divided into two main layers: a lower layer, designated the E layer (sometimes called the Heaviside layer or Kennelly-Heaviside layer), which is between about 80 and 113 km (about 50 and 70 mi) above the Earth's surface and which reflects radio waves of low frequency; and a higher layer, the F layer (sometimes called the Appleton layer), which reflects higher-frequency radio waves.  7, record 2, English, - E%20layer

Record number: 2, Textual support number: 2 CONT

The E layer exists in between the F and D layers, and forms only during daylight. Some radio refraction occurs in the E-layer at very high frequencies (VHF). This phenomenon is called Sporadic-E, because of its sporadic nature.  8, record 2, English, - E%20layer

Record number: 2, Textual support number: 3 CONT

The Kennely-Heaviside Layer... or Heaviside Layer. ... is a layer of ionised gas occurring at 90-150 km in altitude ... It reflects medium-frequency radio waves, and because of this reflection radio waves can be propagated beyond the horizon. Propagation is affected by time of day, season, and sunspot activity. Its existence was announced in 1902 independently and almost simultaneously by the American electrical engineer Arthur Edwin Kennely? (1861-1949) and the British physicist Oliver Heaviside (1850-1925).  9, record 2, English, - E%20layer

Record number: 2, Textual support number: 1 OBS

Heaviside layer: term officially approved by the International Civil Aviation Organization (ICAO).  10, record 2, English, - E%20layer

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Couche de l’ionosphère présentant un ou plusieurs maximums de densité électronique, située vers 110 km.  7, record 2, French, - couche%20E

Record number: 2, Textual support number: 1 CONT

En 1902, l'ingénieur électricien américain Arthur Edwin Kennelly et le physicien britannique Oliver Heaviside(de façon indépendante et presque simultanément) annoncèrent l'existence probable d’une couche de gaz ionisés à haute altitude dans l'atmosphère, affectant la propagation des ondes radioélectriques. Cette couche, autrefois nommée couche de Heaviside, ou de Kennelly-Heaviside, est l'une des nombreuses couches constituant l'ionosphère. Bien que l'ionosphère soit transparente aux longueurs d’onde radio les plus courtes, elle réfracte ou réfléchit les longueurs d’onde plus importantes. Du fait de cette réflexion, les ondes radioélectriques peuvent se propager bien au-delà de l'horizon.  4, record 2, French, - couche%20E

Record number: 2, Textual support number: 2 CONT

[...] le prochain niveau d’ionisation est appelé couche E. [...] Du fait que les électrons et les ions se recombinent assez rapidement ici, le niveau d’ionisation chute rapidement après le coucher du soleil. Bien qu’une petite quantité d’ionisation résiduelle persiste, la couche E disparaît pratiquement la nuit.  8, record 2, French, - couche%20E

Record number: 2, Textual support number: 1 OBS

couche de Heaviside : terme uniformisé par l’Organisation de l’aviation civile internationale (OACI).  9, record 2, French, - couche%20E

Record 2,  Textual support,  Spanish

Record number: 2, Textual support number: 1 DEF

Capa de la ionosfera, situada a unos 110 km de altitud, con uno o varios máximos de densidad de electrones.  3, record 2, Spanish, - capa%20E

Record number: 2, Textual support number: 1 OBS

capa de Heaviside: término aceptado oficialmente por la Organización de Aviación Civil Internacional (OACI).  4, record 2, Spanish, - capa%20E

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 OBS

In calculating the radio line-of-sight distance between a ground station and an aircraft station, the distance from the radio horizon of the aircraft station ... must be added to the distance from the radio horizon of the ground station.  3, record 3, English, - radio%20line%2Dof%2Dsight

Record number: 3, Textual support number: 2 OBS

radio line-of-sight; RLOS: term and abbreviation officially approved by the International Civil Aviation Organization (ICAO).  4, record 3, English, - radio%20line%2Dof%2Dsight

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 OBS

En calculant la distance de l'horizon radio entre une station au sol et une station d’aéronef, il faut ajouter à la distance de l'horizon radio de la station au sol la distance de l'horizon radio de la station d’aéronef [...]  2, record 3, French, - distance%20radio%20%C3%A0%20port%C3%A9e%20optique

Record number: 3, Textual support number: 2 OBS

distance radio à portée optique; RLOS : terme et abréviation uniformisés par l’Organisation de l’aviation civile internationale (OACI).  3, record 3, French, - distance%20radio%20%C3%A0%20port%C3%A9e%20optique

Record 3,  Textual support,  Spanish

Record number: 3, Textual support number: 1 OBS

radioalcance óptico; RLOS: término y abreviatura aceptados oficialmente por la Organización de Aviación Civil Internacional (OACI).  2, record 3, Spanish, - radioalcance%20%C3%B3ptico

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

With a microwave system, essentially requiring line-of-sight links, this would in turn postulate either an extremely dense and costly network of ground stations, (together with the virtual impossibility of including in the network aircraft flying over oceans, unless a system of moored buoys were to be invented), or the provision of some other form of system architecture.  2, record 4, English, - line%2Dof%2Dsight%20link

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

liaison radio ordinaire entre un aéronef et une station au sol ou un autre aéronef séparés par une distance au plus égale à celle de l'horizon.  1, record 4, French, - liaison%20%C3%A0%20vue

Record number: 4, Textual support number: 1 CONT

Avec un système à hyperfréquences, nécessitant essentiellement des liaisons à portée optiques, [le] réseau devrait être extrêmement dense et serait donc très coûteux.  2, record 4, French, - liaison%20%C3%A0%20vue

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 OBS

In the case of those VHF facilities providing service beyond the radio horizon, (...) planning for co-channel operations shall be such that points at the protection heights and at the limits of the functional service area of each facility are separated by distances not less than the sum of distances from each point to its associated radio horizon.  1, record 5, English, - radio%20horizon

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 OBS

Dans les installations UHF dont la portée dépasse l'horizon radio(...) le fonctionnement sur voie commune sera planifié de telle sorte que la distance entre les points situés à la hauteur de protection et aux limites de la zone de couverture utile de chaque installation ne soit pas inférieure à la somme des distances de chacun de ces points à l'horizon radio correspondant.  1, record 5, French, - horizon%20radio

Record 5,  Textual support,  Spanish