File:Duplexer VHF with tunable filters from Cell Wave.jpg
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Summary
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English: This duplexer is a set of tunable filters allowing connection to the same antenna (middle connector: ANT.)
- a transmitter between 160.7 MHz and 161.1 MHz (left connector: TRANS.) and - a receiver between 165.7 MHz and 166.1 MHz (right connector: REC.). To have an effective filtering, one uses resonant cavities with high overvoltage in brass coupled in series and whose size is of the order of a quarter of the wavelength. Plunging rods allow precise tuning and respect the impedance adaptations. Celwave is a brand of Radio Frequency Systems RFS which was absorbed by Alcatel and which still exists in several countries including France in Lannion and Trignac. RFS ranks 2nd in the world and has a long history that begins with insulated wires in 1900 and then by the development of many generations of coaxial cables for very high frequencies. Complete antenna systems are developed, manufactured and marketed and include antennas, cables and all filtering, coupling and protection devices. The current markets are mobile telephony, defence, radio and television broadcasting.Français : Ce duplexeur est un ensemble de filtres accordables permettant de raccorder sur une même antenne (connecteur du milieu: ANT.)
- un émetteur entre 160.7 MHz et 161.1 MHz (connecteur de gauche: TRANS.) et - un récepteur entre 165.7 MHz et 166.1 MHz (connecteur de droite: REC.). Pour avoir un filtrage efficace, on utilise des cavités résonantes à haute surtension en laiton couplées en série et dont la taille est de l'ordre du quart de la longueur d'onde. Des tiges plongeantes permettent un accord précis et respecter les adaptations d'impédance. Celwave est une marque de Radio Frequency Systems RFS qui a été absorbée par Alcatel et qui existe toujours dans plusieurs pays dont la France à Lannion et à Trignac. RFS a le 2ième rang mondial et a une longue histoire qui commence par les fils isolés en 1900 puis par le développement de nombreuses générations de câbles coaxiaux pour les très hautes fréquences. Des systèmes antennaires complets sont développés, fabriqués et commercialisés et ils comprennent les antennes, les câbles et tous les dispositifs de filtrage, couplage, protection. Les marchés actuels sont la téléphonie portable, la défense, la radio et la télé-diffusion. |
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| Source | Own work |
| Author | Fil22plm |
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| current | 17:13, 5 November 2022 | | 1,316 × 1,680 (224 KB) | Fil22plm (talk | contribs) | Uploaded own work with UploadWizard |
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