File:LNB 2.JPG
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Summary
| Description |
Français : Visualisation de l'antenne réceptrice à l'intérieur du cornet amplificateur d'une LNB. English: Cross-section of a low-noise block downconverter, the box on the front of a satellite TV dish that receives the satellite signal collected by the dish, processes it, and sends it via a coaxial cable indoors to a satellite TV receiver that is connected to the TV set. The box has a scalar horn antenna (the funnel with concentric rings, right) which collects the microwave beam and directs it into a waveguide, a short closed metal pipe. Two small metal pins project into the waveguide from the circuit board; these serve as antennas which convert the microwaves to radio frequency alternating currents. On the circuit board (left), these are amplified by a low noise amplifier, then a local oscillator and mixer convert the block of frequencies to a lower block of frequencies, which are output to a jack on the outside of the box (left) to which a coaxial cable is connected to carry the signal inside the house. |
| Date | |
| Source | Own work |
| Author | Laurent06 |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:13, 10 February 2013 | | 5,184 × 3,456 (5.27 MB) | Laurent06 | User created page with UploadWizard |
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