Question
What is the advantage of having multiple receive bandwidth choices on a multimode transceiver?
Answer Options
- A) Permits monitoring several modes at once by selecting a filter that is wide enough to include all the activity
- B) Permits noise or interference to be filtered out that would otherwise reduce signal clarity
- C) Increases the number of frequencies that can be received simultaneously
- D) Increases the power output of the transceiver
Correct Answer: B
Explanation
The primary advantage of having selectable receive bandwidths (filters) is the ability to narrow the filter to include only the desired signal. This process, which is the definition of receiver selectivity (T7A04), permits noise or interference to be filtered out that would otherwise reduce signal clarity.
For example, CW (Morse code) is a very narrow signal, and selecting a very narrow filter (e.g., 250\text{ Hz}) removes most of the interference from strong voice signals or noise on adjacent frequencies. A wider filter (e.g., 3\text{ kHz}) is needed for voice (SSB) to pass all the necessary audio information.
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