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Design And Develop A 88-108MHz  3.5W FM Transmitter
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Design And Develop A 88-108MHz 3.5W FM Transmitter

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  • Full Name Full Name Comment goes here.
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  • all these r not working,plz send real one
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  • your Very good Blog
    But Bad Downloding Othes site better
    Thanks
    Station Ele. Engineer Maha. govt. INDIA
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  • Bad Downloding
    Othes site better
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  • I tried to make a lots of transmitter circuits but none of worked. will you guys send me a 1 to 2 watt sample transmitter circuits.
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    Design And Develop A 88-108MHz  3.5W FM Transmitter Design And Develop A 88-108MHz 3.5W FM Transmitter Presentation Transcript

    • Design and Develop a 88-108MHz 3.5W (8Km) FM Transmitter
      Ramin Farmani - Ahmad Bahreyni
      Summer 2009
    • Preface
      Designing a Transmitter
      FM & AM a brief introduction
      Class C Power Amplifier a brief introduction
      Designing Circuit
      Schematic and PCB
      Dipole and Yagi Antenna
      Tuning
      Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      2
    • Designing a Transmitter
      Analog & Digital Complexity
      Extra Complexity in RF Electronic
      Define our Project Requests
      Governmental Rules in Countries
      Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      3
    • FM & AM Modulation
      FM & AM in Broadcasting
      AM a Brief Introduction
      FM a Brief Introduction
      Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      4
    • Class C Amplifier
      Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      5
      Ic
      Class A
      Class AB
      Class B
      Vce
      Class C
    • Class B Amplifier Review
      The Class B amplifier is biased at cutoff; in other words there is no bias.
      The amplifier relies on the input signal to bias the transistor. The first 0.7 volts of the signal in is lost because the transistor does not turn on until the base voltage reaches 0.7V.
      Amplifier is very efficient but provides ‘crossover distortion’.
      Amplifier is used to amplify power in situations where waveform is not important (power supplies)
      Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      6
    • Class C Biasing
      The Class C amplifier has a negative voltage at the base, and zero volts at the emitter. The Base-Emitter junction is reverse biased. The transistor will turn on at a signal voltage of 4.7V. The transistor will only conduct a small pulse through to the collector output.
      Amplifier is very efficient but has very little usefulness…. Unless….
      Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      7
      About 0.3V
    • Class C Application
      Collector resonant circuit responds to an impulse by ‘ringing’ at its resonant frequency. This is like pushing someone on a swing. A sharp short push each trip allows the swing to oscillate back and forth at its resonant frequency. Collector impulses occur by design at the resonant frequency of the tank circuit. Resonant circuit continues to ring and restores the sine wave at the output Class C Amplifier is used in radio/RF applications and is also called a ‘tuned’ amplifier.
      Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      8
      Positive alternations filled in by
      tank circuit ring
      Resonant (tank) circuit
    • Designing Circuit
      Audio Preamplifier
      Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      9
    • Designing Circuit
      FM Modulator and Oscillator
      Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      10
    • Sep-09
      88-108 MHz 3.5Watt FM Transmitter
      11