IC693MDL648
IC693MDL648IC693MDL648中星6b這顆衛(wèi)星在東經(jīng)115.5,緯度0(赤道),上空(一般3萬多公里)圍繞地球轉(zhuǎn)。
衛(wèi)星電視節(jié)目的接收,無論是現(xiàn)在使用的C波段,還是Ku波段,接收天線的主要形式都是拋物面天線。對(duì)于衛(wèi)星天線的調(diào)試,它包括天線的方向(仰角和方位角)、饋源的位置、極化取向和極化傾斜角調(diào)整等數(shù)項(xiàng)內(nèi)容(可根據(jù)相關(guān)材料查到所需信息)。調(diào)試天線一般在天線安裝場(chǎng)地進(jìn)行,首先要設(shè)置好衛(wèi)星接收機(jī)接收電視信號(hào)的數(shù)據(jù)參數(shù),連接好衛(wèi)星接收天線上的LNB和衛(wèi)星接收機(jī)、電視監(jiān)視器的電纜,然后按照下面的步驟開始調(diào)整天線。
【公 司】: 廈門泰尼電氣有限公司
【主 營】: AB、GE、施耐德等各類PLC產(chǎn)品
【價(jià) 格】: 電議
【發(fā)布人】: 張亮
【電 話】: 18030028083
【所在地】: 福建 - 廈門
【座 機(jī)】: 0592-6809819
【來 源】: 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
Ⅰ、天線的固定
將天線連同支架安裝在天線座架上。天線的方位通常有一定的調(diào)整范圍,應(yīng)保證在接收方向的左右有足夠的調(diào)整余地。對(duì)于具有方位度盤和俯仰度盤的天線,應(yīng)使用權(quán)之方位度盤的0°與正北方向,俯仰度盤的0°與水平面保持一致。正北方向的確定,一般采用指北針測(cè)出地磁北極,再根據(jù)當(dāng)?shù)氐拇牌侵颠M(jìn)行修正,也可利用北極星或太陽確定。
較大的天線一般都采用分瓣包裝運(yùn)輸,故在安裝時(shí),應(yīng)將各部分重新組裝起來。天線組裝后,型面的誤差、主面與副面之間的相對(duì)位置、饋源與副面的相對(duì)位置,均應(yīng)用專用工具進(jìn)行校驗(yàn),保證誤差在允許的范圍內(nèi)。校驗(yàn)完畢,應(yīng)固緊螺栓。
天線饋源安裝是否合理,對(duì)天線的增益影響極大。對(duì)于前饋天線,應(yīng)合饋源的相位中心與拋物面焦點(diǎn)重合;對(duì)于后饋天線,應(yīng)將饋源固定于拋物面頂部錐體的安裝孔上,并調(diào)整副反射面的距離,使拋物面能聚焦于饋源相位中心上。天線的極化器安裝于饋源之后。對(duì)于線極化(水平極化和垂直極化),應(yīng)使饋源輸出口的矩形波導(dǎo)窄邊與極化方向平行;對(duì)于圓極化波(如歷旋圓極化波),應(yīng)使矩形導(dǎo)波口的兩窄邊垂直線與移相器內(nèi)的螺釘或介質(zhì)片所在平面相交成45°角的位置。
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