Design Project: Radio Transmitter

Discrete Semiconductor Devices and Circuits

  • Question 1

    Research the FCC (Federal Communication Commission) guidelines on low-power radio transmitters requiring no licenses. Determine what the maximum power output is, frequency range(s), antenna lengths, transmission time, and any other restrictions relevant to building a small transmitter circuit.

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  • Question 2

    In the very early days of radio communication, a popular style of transmitter was the spark gap circuit. Explain how this circuit functioned, and why it is no longer used as a practical transmitter design.

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  • Question 3

    How is the frequency of your transmitter’s oscillator circuit established? What would you have to do to change that frequency?

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  • Question 4

    Explain the difference between AM (Amplitude Modulation) and FM (Frequency Modulation).

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