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Pregunta 270

What is the function of the Variable Frequency Oscillator (VFO) circuit in a transceiver?

  1. Set the receive and transmit frequencyRespuesta correcta
  2. Provide automatic frequency control
  3. Inject a variable frequency to allow CW reception
  4. Generate and demodulate single sideband signals

Explicación

The VFO is the tunable oscillator whose frequency, mixed with the radio's fixed conversion frequencies, determines where the radio listens and where it transmits, which is why turning the tuning knob moves both. Automatic frequency control and SSB generation are handled by other circuits.

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Pregunta 270: What is the function of the Variable Frequency Oscillator… · FCC Technician Class (Element 2) · Questena