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A communications receiver has four filters installed in it, respectively designated as 250 Hz, 500 Hz, 2.4 kHz and 6 kHz. You are copying a CW transmission and there is a great deal of interference. Which one of the filters would you choose?
250 Hz
A narrow filter like 250 Hz is ideal for CW reception in crowded band conditions, as it significantly reduces interference from nearby signals.
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