ĐIỆN tử VIỄN THÔNG D8DTVT2 nhom8 bai6 khotailieu

Họ tên : Vũ Anh Cường Lê Văn Hải Phạm Hồng Phái Nguyễn Văn Đại Đỗ Mạnh Cường Trần Văn Tuất Lacture : RADiO 1: Vocabulary Wavelength: bước sóng Frequency: tần số Ultraviolet: tia cực tím Visible: nhìn thấy Transmitting: truyền Surface: bề mặt Along: tiến phí trước Curvature: uốn cong Range: phạm vi Mainly : Extant: quy mô Conductor: chất dẫn Sand: cát Absorb: hấp thụ Certain: chắn, cố định Typically: tiêu biểu Ionosphere: tầng điện ly Molecules: phân tử Above: phía Bounces: nảy lên Gradually: Refracted: khúc xạ Reflection: phản chiếu Space wave: sóng trung Transmission: truyền Effective: hiệu 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: Table 2: Sky wave Frequencies 30MHz Space wave VHF, UHF, and microwave signals Travels Skyward and returned to earth by the ionosphere Giving line of sigh transmission Range Hàng nghìn Km 150km Difficulties Attenuated by reflection Hills, building, or trees Task 4: a transmitting aerial e surface wave d space wave c sky wave 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 Absorb Attenuate Communicate Conduct Induct Modulate Reflect Resist Noun (component) Noun (property) Absorber Attenuator Communicator Conductor Inductor Modulator Reflector Resistor Absorption Attenuation Communication Conductivity Induction Modulation Reflection Resistance Task 9: 1) AF : audio frequency : tần số âm = 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 AM carrier 3.AF signal 4.RF carrier Task 11: Component Function Receives weak RF signal 1.Aerial 2.RF tuner Selects the required RF wave Amplified and passed to the detector 3.RF amplifier 4.Detector 5.AF amlifier 6.loudspeaker separates the audio modulation from the RF carrier wave The audio frequency amplifier then amplifies the audio signal to make it strong enough to drive the loudspeaker Converts the audio signal into sound ...Sand: cát Absorb: hấp thụ Certain: chắn, cố định Typically: tiêu biểu Ionosphere: tầng điện ly Molecules: phân tử Above: phía Bounces: nảy lên Gradually: Refracted: khúc xạ Reflection: phản chiếu... trung Transmission: truyền Effective: hiệu Obstacles: cản trở Satellite: vệ tinh Communication: thông tin lien lạc Carry: mang Pass: chuyền Task 2: Table 1: Surface Frequencies Low frequency Travels