ĐIỆN tử VIỄN THÔNG D8DTVT2 nhom8 bai6 khotailieu

Họ và tên : Vũ Anh Cường Lê Văn Hải Phạm Hồng Phái Nguyễn Văn Đại Đỗ Mạnh Cường Trần Văn Tuất Lacture 6 : RADiO 1: Vocabulary Wavelength: bước sóng Frequency: tần số Ultraviolet:

Họ và tên : Vũ Anh Cường

Lê Văn Hải

Phạm Hồng Phái

Nguyễn Văn Đại

Đỗ Mạnh Cường

Trần Văn Tuất

Lacture 6 : RADiO

1: Vocabulary

Wavelength: bước sóng

Frequency: tần số

Ultraviolet: tia cực tím

Visible: nhìn thấy

Transmitting: truyền

Surface: bề mặt

Along: tiến về phí trước

Curvature: uốn cong

Range: phạm vi

Mainly : chính

Extant: quy mô

Conductor: chất dẫn

Sand: cát

Absorb: hấp thụ

Certain: chắc chắn, cố định

Typically: tiêu biểu

Ionosphere: tầng điện ly

Molecules: phân tử

Above: phía trên

Bounces: nảy lên

Gradually: dần dần

Refracted: khúc xạ

Reflection: phản chiếu

Space wave: sóng trung

Transmission: truyền

Effective: hiệu quả

Obstacles: cản trở

Satellite: vệ tinh

Communication: thông tin lien lạc

Carry: mang

Pass: chuyền

Task 2:

Table 1:

Surface

Frequencies Low frequency

Travels This travel along the ground

Range 1500km

Difficulties Absorption by the ground

Task 3:

Frequencies 30MHz VHF, UHF, and microwave signals

the ionosphere Giving line of sigh transmission.

Difficulties Attenuated by reflection Hills, building, or trees

Task 4:

1 a transmitting aerial

5 b receiving aerial

Task 5:

1: When the switch is closed, current flows through the primary of the transformer 2: On striking, the radar signal is reflected.

3: When dischargi quickly, a cell may become hot.

4: On receiving from the remote control,the TV follows your instructions.

5: On receiving the reflected signal, the signal is compared with the transmitted signal 6: When choosing a course in electronics, you think carefully about your future.

7: On striking a high building, microwave signals are deflected.

8: When making a recording, you should ensure the recording levels are satisfactory 9: On detecing an intrucder, the alarm triggers an audible warning.

10: On pressing remote control button, the television set changes channel.

Task 7:

Verb Noun (component) Noun (property)

Attenuate Attenuator Attenuation

Communicate Communicator Communication

Task 9:

1) AF : audio frequency : tần số âm thanh = âm tầng 2) RF : radio frequency : tần số vô tuyến = cao tầng 3) AM : amplitude-modulated : điều biên

4) FM : frequency-modulated : điều tần

Task 10:

1.FM carrier

2 AM carrier

3.AF signal

4.RF carrier

Task 11:

3.RF amplifier

Amplified and passed to the detector

carrier wave

5.AF amlifier The audio frequency amplifier then amplifies the audio signal to make it strong enough to drive the

loudspeaker

6.loudspeaker

Converts the audio signal into sound