LNB_2.JPG
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Summary
Description LNB 2.JPG |
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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