Question
Which of the following can cause radio frequency interference?
Answer Options
- A) Fundamental overload
- B) Harmonics
- C) Spurious emissions
- D) All these choices are correct
Correct Answer: D
Explanation
All three are primary categories of radio frequency interference (RFI).
- Fundamental overload occurs when a receiver’s front-end is overwhelmed by the sheer strength of a nearby signal, causing it to demodulate the amateur signal unintentionally (T7B02).
- Harmonics are signals transmitted at exact integer multiples of the fundamental operating frequency (e.g., 14\text{ MHz}, 28\text{ MHz}, 42\text{ MHz}), which may fall onto other licensed bands.
- Spurious emissions are any unwanted signals emitted at frequencies other than the fundamental or its harmonics. Poor shielding or filtering can cause all of these to interfere with other electronic devices or radio services.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!