File:Kreuzdipolarp.jpg
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Summary
| Description |
English: Yagi turnstile antenna array for reception of weather satellite signals on 137-138 MHz at the European Space Agency (ESA) Redu satellite communication station near the village of Redu, Belgium, 1969-2003. In this frequency range satellites transmit signals in circular polarization so that the signal can be received regardless of relative antenna orientation, necessitating a circularly polarized ground antenna. Each of the six components of the array consists of two 9 element Yagi antennas mounted at right angles on the same axis and fed with a 90° phase difference, creating a circularly-polarized beam of radio waves.
Français : tableau d'antennes Yagi tourniquet pour la réception des signaux dans la bande 137-138 MHz des satellites météorologiques à l' Agence spatiale européenne (ESA) à proximité du village de Redu en Belgique, 1969-2003. Dans cette gamme de fréquences les satellites émettent des signaux en polarisation circulaire de sorte que le signal peut être reçu indépendamment du rapport de dépolarisation des antennes, nécessite une antenne de sol en polarisation circulaire. Chacun des six composants de la matrice est constituée de deux éléments 9 antennes Yagi monté à angle droit sur le même axe et alimenté avec une différence de phase de 90°,crée un faisceau à polarisation circulaire des ondes radio. |
| Source | Self-photographed |
| Author | Dantor |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:08, 29 September 2006 | | 592 × 824 (143 KB) | Dantor | Cross Yagi-Antenna array for 136-138 MHz ESA Earth station Redu 1969-2003 Own photograph |
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