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 and converts them to a signal which is sent through a cable to the receiver inside the building.

LNB又叫高频头（Low Noise Block），即低噪声下变频器，其功能是将由馈源传送的卫星信号经过放大和下变频，把Ku或C波段信号变成L波段，经同轴电缆传送给卫星接收机。

2017年7月24日 · LNB（Low Noise Block down-converter），低噪声下变频器。 悬架于“锅”表面上方。 用于接收锅面反射的卫星信号。 其功能是将由馈源传送的卫星信号经过放大和下变频，把Ku或C波段信号频谱搬移到L波段。 然后经同轴电缆传送给卫星信号接收机（如DVBS机顶盒，电视等）。 因卫星讯号在抵达天线（锅）前已相当微弱及同轴电缆传输的频率越高讯号损耗越大，所以才需要LNB来做改善（低噪放大）。 LNB的工作流程，先将卫星高频讯号放大至数十万倍， …

2006年3月21日 · The abbreviation LNB stands for Low Noise Block. It is the device on the front of a satellite dish that receives the very low level microwave signal from the satellite, amplifies it, changes the signals to a lower frequency band and sends …

An LNB has two important functions: it’s a low-noise amplifier, meaning that it takes the extremely weak satellite signal and amplifies it. It’s also a block downconverter, meaning it takes the signals on the super-high satellite frequencies and converts them to lower frequencies.

2022年7月27日 · Ku波段范围比较广，无法用单个本振频率覆盖整个Ku波段的10700~12750MHz，为了能够覆盖整个Ku波段，所以就有了双本振频率的LNB，一般Ku波段有两种双本振的LNB，即9750/10600MHz和9750/10750MHz，都能覆盖整个Ku波段，一般单本振频率的LNB有两种，即10750MHz和11300MHz。

LNB又叫高频头（Low Noise Block），即低噪声下变频器，其功能是将由馈源传送的卫星信号经过放大和下变频，把Ku或C波段信号变成L波段，经同轴电缆传送给卫星接收机。

LNB (Low Noise Block Down Converter) A device mounted on the dish, designed to amplify the satellite signals and convert them from a high frequency to a lower frequency. LNBs can be controlled to receive signals with different polarisation.

2023年10月17日 · LNA, LNB, LNC and LND are terms often heard during discussions on satellite communications. LNA is a low noise amplifier, which can amplify weak satellite signals without worsening signal to noise ratio. LNB or low noise block converter is also known as LNC or low noise converter. It is also sometimes called LND or low noise downconverter.

2019年10月1日 · The easiest way to define “LNB” is “the thing at the front part of a dish. It’s actually the only part of the dish that does any work. What we call a satellite dish is more properly referred to as a high-frequency parabolic antenna.