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incoming signals. The antenna is a notch antenna. It is a length of
U-shaped fiberglass dielectric material sealed within the leading edge of
the vertical stabilizer. The feed line from the antenna coupler is
connected to a point on the metallic portion of the antenna. The antenna
design allows the coupler to match the antenna impedance to the
transmitters impedance of 50 ohms.
Fig. 44-5 HF antenna
[6] Fig. 44-6 shows the HF communication system component
locations.3-phase, 115 volt, 400Hz, ac circuit breakers supply power to
the HF communication system. They are on the left and right load control
centers. HF-1 circuit breaker is on the P18 panel; HF-2 circuit breaker is
on P6 panel. The HF control panel is located on the aft electronics
control panel (P8). The transceivers are located on the electronic
equipment rack E5-2. The antenna couplers are in the vertical stabilizer.
Fig. 44-6 HF COMM system component locations
They are accessible from the left and right side of the lower section of the
vertical stabilizer. The HF antenna, feed line and RF shield are inside of
the vertical stabilizer.
Questions to Lesson 44:
1. What is the HF system?
2. What is the ground wave propagation used for ?
3. What is the sky wave propagation used for ?
4. What is the sky wave propagation distance dependent on ?
5. What does the HF communication system consist of ?
6. What does the control panel provide ?
7. How is the transceiver enabled ?
8. What is the purpose of HF antenna ?
9. What does the mode control switch control ?
10. What does the RF SENSE potentiometer control ?
11. What is the use of HF comm transceiver ?
12. Where are the audio and keying signals from ? What are the use of
these signals?
13. Is the power output of transceiver 400 watts in the AM mode?
14. What is the function of SQL/LAMP TEST switch ?
15. What is the purpose of the HF comm antenna ?
16. What is the HF comm antenna ? Give a brief description.
17. What circuit breakers supply power to the HF communication system ?
Where are these circuit breaker located on ?
18. Where is the HF control panel located on ?
19. Where are the transceivers located on ?
20. How to access to the antenna coupler ?
EXERCISE
A. Translate Paragraph 1, 2, 3, 4 and 5 into Chinese.
B. Explain the following abbreviations and acronyms.
1. USB
2. PEP
3. SSB
4. SQL
5. RF
6. HF COMM
7. DACS
8. AM
9. LED
10. LRU
11. FWD
C. Answer the questions to Lesson 44.
LESSON 45
AURAL WARNING SYSTEM
VOCABULARY
1. aural warning system 音響警告系統
2. alert…to (the fact that) 提醒……注意（如下事實）
3. abnormal [ æb' n :ml ] a. 不正常的
4. bracket [ 'brækit ] n. 括號
5. allocate [ 'ælkeit ] vt. 分配（派）
6. activity [ æk' tiviti ] n. 活動； 作用
7. SELCAL = Selective Calling System 選擇呼叫系統
8. assign [ ' sain ] vt. 指定； 賦予
9. unique [ ju: 'ni:k ] a. 唯一的； 獨特的
10. correspond to [ k ris' p ndi ] 符合（相當）于
11. individual [ indi' vidjul ] a. 單個的； 單獨的
12. proper [ 'pr p ] a. 適合的； 獨特的
13. potentially [ p' tenli ] ad. 潛伏的； 可能的
14. dangerous [ 'deind rs ] a. 有危險的
15. chime [ taim ] n. 諧音； 鐘聲
16. clacker [ klæk ] n. 發生器
17. immediate [ i'mi:djt ] a. 立即的
18. attention [ ' tenn ] n. 注意； 留心
19. wailer [ weil ] n. 呼嘯聲
20. schematic [ ski 'mætik ] n. 簡圖； 略圖
21. intermittent [ int' mitnt ] a. 間歇的； 中斷的
22. priority [ prai' riti ] n. 優先權
23. ELEX = Electrical
24. HI = High
25. LO = Low
26. interrupter [ int' rpt ] n. 斷續器； 間斷器
27. F/O = First Officer
28. CAPT = Captain
29. multivibrator [ 'mlti ' vaibreit ] n. 多諧振蕩器
30. ring [ ri ] n. 鈴； v. 按鈴； 振鈴
TEXT
[1] The flight deck aural warning system provides characteristic audio
signals to alert the flight crew to : an abnormal takeoff condition, landing
condition, autopilot disengage, pressurization condition (cabin altitude
warning ), mach airspeed condition, an engine fire, APU fire, wheel well
fire, crew calls and SELCAL alert. Certain explanations for SELCAL
are in the bracket. (Airline radio networks provide radio communication
between airline ground facilities and airplanes enroute. Since the number
of radio channels allocated to this activity is limited, crews of many
　
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