#384: What is the bandwidth of a CW / Morse code signal? (as a function of speed and rise/fall time)
The occupied bandwidth (OBW) of a CW / Morse code signal is primarily dependent upon the keying speed (Words per minute / WPM) and the rise/fall time of the RF envelope. Radios and operator practice give you control over the WPM, but not many radios give you control over the RF rise and fall time (which can have a major effect). This video shows measurements of the Occupied BW at various keyer speeds and RF rise/fall times. Equipment used in this video include:
Tektronix MSO44B oscilloscope:
Tektronix AFG31252 Arbitrary Waveform Generator:
Notes from this video:
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