BUC 与 LNB 的区别
BUC是Block Up Converter的缩写形式，而LNB是Low Noise Block Converter的缩写形式。
这些设备BUC和LNB都用于VSAT传输系统中，用于通过卫星将语音/数据中继到地球的更大部分。
BUC向上锁定转换器
如前所述，BUC代表Block Up Converter。如图所示，它在一个封装中包含两个模块，即RF上变频器和RF功率放大器。以下是BUC的功能：
•频率转换，即将低频转换为高频。此过程称为RF上变频，模块简称为RF上变频。
•放大，即提高上一个模块中转换的RF信号的幅度水平。此过程称为RF放大，模块称为RF放大器。
使用BUC代替两个单独的模块（上变频器和放大器）的优点是成本较低且易于安装。BUC位于卫星调制解调器（即调制器输出）和天线之间。
LNB-低噪声模块转换器
如前所述，LNB代表低噪声块转换器。如图所示，它在一个封装中包含两个模块，即RF LNA和RF下变频器。LNB的功能如下：
•低噪声放大，即在保持CNR（载波噪声比）的同时，提高接收到的RF信号的幅度，以避免任何失真。
•频率转换，即将高频转换为低频。此过程称为RF下变频，模块简称为RF Down转换器。
使用LNB代替两个单独的模块（LNA和下变频器）的优点是成本较低且易于安装。LNB位于卫星调制解调器（即解调器输入）和天线之间。
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BUC is the short form of Block Up Converter and LNB is the short form of Low Noise Block Converter.
Both of these devices BUC and LNB are used in VSAT transmission systems for relaying voice/data via satellite to larger portion of the earth.
BUC-Block Up Converter
As mentioned BUC stands for Block Up Converter. As shown in the figure it consists of two modules in one package i.e. RF Up converter and RF power amplifier. Following are the functions of BUC:
• Frequency conversion i.e. it converts lower frequency to higher frequency. This process is referred as RF up conversion and module is reffered as RF up converter.
• Amplification i.e. it boosts amplitude level of RF signal converted in the previous module. This process is referred as RF amplification and module is referred as RF Amplifier.
The advantages of using BUC in place of two separate modules (up converter and amplifier) are less cost and easy installation. BUC is placed between satellite modem (i.e. modulator output) and antenna.
LNB-Low Noise Block Converter
As mentioned LNB stands for Low Noise Block Converter. As shown in the figure it consists of two modules in one package i.e. RF LNA and RF Down converter. Following are the functions of LNB:
• Low Noise Amplification i.e. it boosts amplitude level of received RF signal while maintaining CNR (carrier to Noise Ratio) in order to avoid any distortion.
• Frequency conversion i.e. it converts higher frequency to lower frequency. This process is referred as RF down conversion and module is reffered as RF Down converter.
The advantages of using LNB in place of two separate modules (LNA and down converter) are less cost and easy installation. LNB is placed between satellite modem (i.e. demodulator input) and antenna.
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