Basic Qualification · B-004 Circuit components · B-004-001-005
What range of frequencies does the speech amplifier of an amateur radio transceiver typically process?
- A 300 Hz to 3 000 Hz
- B 3 Hz to 300 Hz
- C 300 Hz to 1 000 Hz
- D 40 Hz to 40 000 Hz
Correct answer: A — 300 Hz to 3 000 Hz. From the official ISED question bank, verified word for word.
Why
Human speech contains most of its intelligible information between 300 hertz and 3 000 hertz, so the speech amplifier in a transceiver is designed to boost only this specific range to ensure clear communication while filtering out unnecessary noise. The full explanation — and one for every question — is in Pro.
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The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.