What is the most common method of reducing key clicks?
Increase keying waveform rise and fall times✓الإجابة الصحيحة
Insert low-pass filters at the transmitter output
Reduce keying waveform rise and fall times
Insert high-pass filters at the transmitter output
الشرح
Because the clicks come from envelope transitions that are too fast, the cure is to slow them down, typically by shaping the keying waveform to a few milliseconds of rise and fall. Filters at the transmitter output do not help, since the click sidebands lie close to the carrier and inside the passband.