BUC 與 LNB 的區(qū)別

BUC是Block Up Converter的縮寫形式，而LNB是Low Noise Block Converter的縮寫形式。

這些設(shè)備BUC和LNB都用于VSAT傳輸系統(tǒng)中，用于通過衛(wèi)星將語音/數(shù)據(jù)中繼到地球的更大部分。

BUC向上鎖定轉(zhuǎn)換器

如前所述，BUC代表Block Up Converter。如圖所示，它在一個封裝中包含兩個模塊，即RF上變頻器和RF功率放大器。以下是BUC的功能：
?頻率轉(zhuǎn)換，即將低頻轉(zhuǎn)換為高頻。此過程稱為RF上變頻，模塊簡稱為RF上變頻。
?放大，即提高上一個模塊中轉(zhuǎn)換的RF信號的幅度水平。此過程稱為RF放大，模塊稱為RF放大器。

使用BUC代替兩個單獨(dú)的模塊（上變頻器和放大器）的優(yōu)點(diǎn)是成本較低且易于安裝。BUC位于衛(wèi)星調(diào)制解調(diào)器（即調(diào)制器輸出）和天線之間。

LNB-低噪聲模塊轉(zhuǎn)換器

如前所述，LNB代表低噪聲塊轉(zhuǎn)換器。如圖所示，它在一個封裝中包含兩個模塊，即RF LNA和RF下變頻器。LNB的功能如下：
?低噪聲放大，即在保持CNR（載波噪聲比）的同時，提高接收到的RF信號的幅度，以避免任何失真。
?頻率轉(zhuǎn)換，即將高頻轉(zhuǎn)換為低頻。此過程稱為RF下變頻，模塊簡稱為RF Down轉(zhuǎn)換器。

使用LNB代替兩個單獨(dú)的模塊（LNA和下變頻器）的優(yōu)點(diǎn)是成本較低且易于安裝。LNB位于衛(wèi)星調(diào)制解調(diào)器（即解調(diào)器輸入）和天線之間。

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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 ofBUC:
?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 ofLNB:
?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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