Low-noise block downconverter
（重定向自Low noise blockconverter）
![](/Images/godic/202501/25/136_to_174_MHz_base_station_antennas0534.jpg")
![LNBF disassembled (All Parts). The waveguide 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.](/Images/godic/202501/25/LNB_dissassembled0534.JPG")
![Cross-section across a low-noise block downconverter.](/Images/godic/202501/25/LNB_10534.JPG")
![Viewing of the pin and the horn antenna in a low-noise block downconverter.](/Images/godic/202501/25/LNB_20534.JPG")
A low-noise block downconverter (LNB) is the receiving device mounted on satellite dishes used for satellite TV reception, which collects the radio waves from the dish. Also called a low-noise block, low-noise converter (LNC), or even low-noise downconverter (LND), the device is sometimes wrongly called an low-noise amplifier (LNA).