IC693MDL654IC693MDL654
IC693MDL654天線方向的調(diào)整確定正南方向。先由當(dāng)?shù)卮牌悄曜冎岛蛥⒖寄曛担ú楸慝@得),計(jì)算當(dāng)?shù)禺?dāng)時(shí)的磁偏角(磁偏角=參考年值+年變值*年差),然后再用羅盤(或指南針)確定地磁南極方向,最后用計(jì)算的磁偏角,修正地磁南極,得到正南方向(正南=地磁南極+磁偏角)。另外,因?yàn)樘炀€座架的實(shí)際指向一般都對(duì)著正南方向,幫可直接以天線座架的指向作參考,進(jìn)行天線調(diào)整。
進(jìn)行方向調(diào)試。天線方向的調(diào)試,具體地說(shuō)就是根據(jù)事先算出的仰角和方位角,將天線的這兩個(gè)角度分別調(diào)到這兩個(gè)數(shù)值上,使之對(duì)準(zhǔn)所要接收的衛(wèi)星,接收到電視信號(hào),這就是粗調(diào)。然后進(jìn)行細(xì)調(diào),使所收的信號(hào)最佳。粗調(diào)是基礎(chǔ),如何判斷天線的仰角和方位角已調(diào)到事先所算出的角度上呢?根據(jù)現(xiàn)場(chǎng)的條件和個(gè)人的不同條情況,可以有多種簡(jiǎn)易而有效的方法。
【公 司】: 廈門泰尼電氣有限公司
【主 營(yíng)】: 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(lái) 源】: 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
1、方位角的調(diào)整
天線安裝好以后,將高頻頭有標(biāo)牌的一面水平朝上,然后利用指南針找到正南方向,并在天線的立柱上做好正南的標(biāo)記。同時(shí)應(yīng)了解要找的衛(wèi)星方位角是正南的偏東或偏西多少度。然后找一皮尺測(cè)量立柱的周長(zhǎng)為多少厘米,在用360度除以它,得到每厘米為多少度。然后再用方位角去除以每厘米對(duì)應(yīng)的度數(shù),也就是得到了需要轉(zhuǎn)動(dòng)多少厘米。即可將天線轉(zhuǎn)動(dòng)到附近位置。
2、仰角的調(diào)整
經(jīng)簡(jiǎn)單計(jì)算與實(shí)踐得出結(jié)論,仰角應(yīng)為:將計(jì)算出的仰角減去20度的值(因?yàn)椴捎玫牟煌炀€誤差在19度~22度之間)。然后將指南針?lè)胖茫?xì)調(diào)仰角使指針為計(jì)算出的差值(誤差在正負(fù)1度之間),這一點(diǎn)是天線調(diào)試成敗的關(guān)鍵。 Superior Electric M061-FD-61101 Slo-Syn Stepper Motor
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