A.天線跑偏 B.我站水平極化LNA故障 C.衛(wèi)星上對(duì)應(yīng)轉(zhuǎn)發(fā)器故障 D.我站水平極化線路故障
A.使輸出匹配 B.抑制輸入信號(hào)的諧波 C.降低工作點(diǎn)功率
A.前焦點(diǎn) B.后焦點(diǎn) C.實(shí)焦點(diǎn) D.虛焦點(diǎn)