ĐIỆN tử VIỄN THÔNG DTVT2 nhom5 bai6 khotailieu

UNIT 6: RADIO Vocabulary Appear …………………….xuất Actual ………………………thực tế Application ……………….ứng dụng Alphanumeric ……………ký tự Cost …………………………chi phí Circuit …………………… mạch điện Classify ……………………phân loại Digit ……………………… số Denote …………………… ký hiệu Electrolytic capacitor ….tụ hóa Ease ……………………….làm giảm bớt Electromagnetic wave … sóng điện từ Enable …………………… cho phép Electrolytic ……………… điện phân Exist ……………………… tồn Extreme ……………………cực Employ …………………….dùng Fact …………………………thực tế, thật Figure ………………………hình dung Finally ………………………cuối, sau Grey ……………………… xám General purpose ……….thường dùng Limited…………………… giới hạn Light emitting diode …… phát quang Letter ……………………… chữ Range …………………… dãy, loạt Resistor ……………………điện trở Impedance ……………… trở kháng Reflect …………………… phản ánh Range …………………… dãy, loạt Reach …………………… tới Relaxing the tolerance du vi sai số Preamp…………………… tiền khuếch đại Poor manufactory …… sản xuất tồi Power amp ……………… KĐ công suất Production ……………… công việc sx Position ………………… vị trí Produce ………………… sản xuất Positive terminal ……… cực dương Product …………………… sản phẩm Prefer …………………… thích Power rectifier diode … diode chỉnh lưu Particular ………………… riêng biệt Satisfactory …………… thỏa đáng Semiconductor ………… chất bán dẫn Seem ……………………… Tuning-in Study this diagram Name five things, other than radio which make use of electromagnetic waves Rays ……………………… tia Gamma rays …………… tia Gamma Ultraviolet rays………… tia cực tím Infra-red rays …………….tia hồng ngoại Radio waves …………… sóng phát Wavelength ………………bước sóng Short wavelength……….bước sóng ngắn Long wavelength ……….bước sóng dài Low frequency ………… tần số thấp High frequency ………….tần số cao Visible light ……………….ánh sáng nhìn thấy TASK2 Table Surface wave Frequencies (tần số) low frequency Travels (đường truyền) along the ground Range (khoảng cách) 1500km Difficulties (khó khăn) absorption by the ground TASK3 Table Sky wave Space wave Frequencies (tần số) Travels (đường truyền) below 300MHz Skywards and returned to earth by the ionosphere VHF, UHF line of sight transmission Task : a transmitting aerial e surface wave d space wave c sky wave b receiving aerial TASK a The switch is closed b Current flows through the primary of the transformer When the switch is closed, current flows through the primary of the Transformer a The radar signal strikes a plane b The radar signal is reflected On striking, The radar signal is reflected a A cell discharges quickly b A cell may become hot When discharging quickly, A cell may become hot a The TV receives signals from the remote control b The TV follows your instructions On receiving signals from the remote control, the TV follows your instructions a The radar receiver receives the reflected signal b The signal is compared with the transmitted signal On receiving the reflected signal, the signal is compared with the transmitted signal a You choose a course in electronics b You think carefully about your future When choosing a course in electronics, you think carefully about your future a Microwave signals strike a high building b Microwave signals are deflected On striking a high building, microwave signals are deflected a You make a recording b You should ensure the recording levels are satisfactory When making a recording, you should ensure the recording levels are satisfactory a The alarm detects an intruder b The alarm triggers an audible warning On detecting an intruder, the alarm triggers an audible warning 10 a The remote control button is pressed b The television set changes channel On pressing remote control button, the television set changes channel Task : Verb Noun (component) Noun (property) Absorb Absorber Absorption Attenuate Attenuator Attenuation Communicate Communicator Communication Conduct Conductor Conductivity Induct Inductor Induction Modulate Modulator Modulation Reflect Reflector Reflection Resist Resistor Resistance TASK9 : AF audio frequency : RF Radio frequency : AM Amplitude modulated 4: FM Frequency modulated Task 10: Identify the wave Use these terms a : RF carier b: AF signal c: AM carrier d: FM carrier FM - Frequency modulated - High frequency ( 76 MHz – 130 Mhz) - Signals near AM - Amplitude modulated - Low frequency ( 30KHz – 16MHz) - Signals travel farther Task 11: Component Aerial Function Receiver weak RF signals RF tuner Modulater Rf carrier RF amplifier Amplifier RF wave Detector Detect RF signal AF amplifier Amplifier AF signal Loudspeaker Convert the audio signal into sound TASK 12 Radio waves are very popular in today's life It was used extensively in the field of communication today Here are all described block diagram of a simple radio receiver Diagram includes seven components Aerial is receiving antenna, receiver RF carrier is modulated and put into an amplifier Audio signal is separated from the carrier and into the audio signal amplifier and power amplifier signal audio signal after amplification was converted and emitted speakers  ... Light emitting diode …… phát quang Letter ……………………… chữ Range …………………… dãy, loạt Resistor ………………… điện trở Impedance ……………… trở kháng Reflect …………………… phản ánh Range …………………… dãy, loạt Reach ……………………