Question
Which term describes the ability of a receiver to discriminate between multiple signals?
Answer Options
- A) Discrimination ratio
- B) Sensitivity
- C) Selectivity
- D) Harmonic distortion
Correct Answer: C
Explanation
The ability of a receiver to successfully pick out the desired signal and reject all others operating on nearby frequencies is called Selectivity. This is a measure of how effective the receiver’s filters are in reducing interference.
Good selectivity is vital for operating in crowded amateur bands. For example, high selectivity allows a receiver to hear a weak voice signal (SSB) clearly without interference from a much stronger signal operating just a few kilohertz away. This is primarily achieved using switchable bandwidth filters (T4B08).
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