> Good point. I believe that the narrowband noise does make it
> harder under some circumstances to pick out a weak signal.
Depends on the noise. With white noise, selectivity helps. With
rough noises, it can hurt because the filter ringing will draw out the
pulses and increase noise pulse duration.
For example, on a quiet day on 160 meters with only a steady
background hiss I find even a 125 Hz filter helps me copy weak
signals, especially when set for a low pitch.
When there are static crashes, or worse yet an accumulation of
several storms causing static (or powerline buzz or other harsh
hash) running my receivers with SSB filters and no AGC is much
73, Tom W8JI
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