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4. major [ 'meid  ] a. 主要的;較大的
5. feature [ 'fi:t ] n. 特征;特點;面貌
6. rainfall [ 'reinf :l ] n. 雨量降雨(量)
7. return [ ri' t:n ] n. 回波
8. azimuth [ 'æzim ] n. 方位(角)
9. depend on [ di'pend ] 取決于;依賴
10. shape [ eip ] n. 形狀;形式; 樣子
11. R/T = Receiver/Transmitter 收發機(裝置)
12. tilt [ tilt ] v. 傾斜;俯仰運動
13. antenna stabilization [ steibilai'zein ] 天線穩定(性)
14. clutter [ 'klt ] n. 雜(亂回)波;地面反射干擾
15. suppression [ s'pren ] n.抑制;排除
16. microprocessor [ mai'kr 'prouses ] n. 微處理機
17. adjust [  'd st ] vt. 調節
18. detent [ di'tent ] n. 銷;鎖定
19. CAL = calibrate [ 'kælibreit ] vt. 校準;檢驗;測定
20. switch to 轉到;換到
21. only if 只有在…的時候才…
22. interlock [ int'l k ] v. [ 'intl k ] 互鎖;聯鎖
23. at any one time 在任何一個時刻
24. turn on 打開;接通;開動;朝向
25. turn off 關閉;斷開;停住;避開
26. for a (the ) second time 第二次
27. narrow [ 'nærou ] a. 狹窄的
28. pencil beam [ 'pensl ][bi:m ] 銳方向性射束; 鉛筆波
29. back and forth 來回地;前后地
30. sweep [ swi:p ] v. ; n. 掃掠;掃射
31. horizon [ h'raizn ] n. 地(水)平線
32. antenna pedestal [ 'pedistl ] n. 天線(基)座
33. diameter [ dai' æmit ] n. 直徑
34. flat plate [ flæt ][pleit ] 平板
35. make up 組成;形成
36. phased array radiator 相控陣發射器
37. feedback [ 'fi:dbæk ] n. 反饋
38. scan [ skæn ] n. ; v. 掃描;搜索
39. stepper motor [ 'step ]['mout ] 步進馬達
40. via [ 'vai ] prep. 經由;通過
41. elevation [ eli' vein ] n. 標高;仰角;升降;俯仰
42. disable [ di'seibl ] vt. 無效;不能…;無能力
43. waveguide [ 'weivgaid ] n. 波導(管)
44. rigid [ 'rid id ] a. 堅硬的;剛性的
45. quick-disconnect 快速斷開
46. clamp [ klæmp ] n. 支架;夾具
47. flexible [ 'fleksbl ] a. 柔軟的;可彎曲的
48. zero monitor 零位監控器
49. incremental monitor [ inkri'mntl]['m nit] 增量監控器
50. heavy [ 'hevi ] a. ; n. 重的;大量的
51. appear [ ' pi ] vi. 出現;顯現
52. moderate [ 'm drit ] a. 中等的
53. light [ lait ] a. 輕的;少量的
54. message [ 'mesid ] n. 信息
TEXT
[1] The weather radar (WXR) system provides the flight crew with a display of
moisture-laden weather formations or of major terrain features.
The weather radar system transmits radio frequency (rf) pulses in a 180-degree
arc forward of the airplane. Rainfall or terrain features reflect the pulses back to
the airplane and are processed . The time between the transmission and the
reception of these returns will determine the rainfall or terrain range while the
antenna position determines the azimuth.
Fig. 29-1 WXR introduction
[2] The weather radar returns are shown on EHSI. For rainfall returns, the
amplitude depends on the rainfall intensity. This allows the system to show
areas of various weather conditions using different colors. For terrain returns,
the amplitude depends on the characteristics of the ground surface. This allows
the system to show the shape of major ground features.
[3] A weather radar system consists of a receiver/transmitter (R/T), an antenna,
control panels and indicators (EHSI). The WXR control panel provides mode
selection, antenna tilt control and system gain control. The control panel also
allows for the selection of antenna stabilization and ground clutter suppression.
A microprocessor within the control panel converts each switch position into a
digital format and transimts the data to the transceiver using an ARINC 429 data
bus.
Fig. 29-2 WXR control panel
 GAIN
The system gain may be adjusted in the WX, WX+T, or MAP modes by the
GAIN control. The control has ten detented positions including the CAL
position, where the system gain is automatically calibrated.
 TILT
The antenna tilt position is controlled by the TILT control. The tilt range is
from 15 down to 15 up.
 WX
Pushing the WX pushbutton switches the R/T unit to the weather mode, and
weather data will be shown on the EHSI.
 WX+T
Pushing the WX+T pushbutton switches the R/T unit to the weather plus
turbulence mode, and turbulence as well as weather data will be shown on the
EHSI . The turbulence mode is active only if a range of 40 NM (nautical mile)
or less is selected on the EFIS control panel.If a range greater than 40 NM is
selected, only weather data will be shown.
　
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