Ku-band LNB with both sides uncovered. TV reception, which collects the radio waves from the dish and converts them to a signal which is sent through a cable to the receiver inside the building. The microwave signal from the dish is picked up by a feedhorn on the LNB and is fed to a section of waveguide. One or more metal pins, or probes, protrude into the waveguide at right angles to the axis and act as antennas, feeding the signal to a PCB block diagram of tv transmitter and receiver pdf the LNB’s shielded box for processing.
The lower frequency IF output signal emerges from a socket on the box to which the coaxial cable connects. The waveguide from the feedhorn, carrying the microwave radio signal collected by the dish passes through the hole in the center. The pins visible at the top and left side of the hole project into the waveguide and receive the signal, converting it to radio frequency alternating currents which are processed by the circuit board.