Question
What does the MDS of a receiver represent?
Answer Options
- A) The meter display sensitivity
- B) The minimum discernible signal
- C) The modulation distortion specification
- D) The maximum detectable spectrum
Correct Answer: B
Explanation
MDS is a fundamental specification of a receiver’s performance that quantifies its ability to detect the very weakest signals, especially those near or below the background noise level. It is a critical metric for amateur operators interested in DXing (long distance) or weak-signal communication.
MDS stands for The Minimum Discernible Signal (or Minimum Detectable Signal). It is generally defined as the lowest input signal level (in \text{dBm}) that produces a recognizable output from the receiver, typically corresponding to a signal that is just barely stronger than the receiver’s own internal noise floor, usually measured at a 3 \text{ dB} signal-to-noise ratio in a specified bandwidth.
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