>> On 3/29/2016 10:38 AM, Jim Brown wrote:
WRONG! CW speed has NOTHING to do with bandwidth, which is
determined by RISE and FALL times of the keying waveform and
distortion in the RF stages.
The standard word "paris" has 48 elements. That makes the baud rate
for CW (48/60) x WPM or 0.80 x WPM.
ITU defines the "Necessary Bandwidth" for CW as 3 or 5 times the speed
in bits per second (baud rate) where 3 x is for "non fading circuits"
(where the waveform does not need to be so "sharp") and 5 x for "fading
circuits." See:
http://http://life.itu.ch/radioclub/rr/ap01.htm part B.
The same table is found in Title 97, Part 2 of the Code of Federal
Regulations (FCC Rules) as ยง2.202(g)
The constant 'K' sets the minimum bandwidth needed/occupied for the two
recognized cases. Occupied bandwidth in excess of K=5 (or 400 Hz for
100 WPM) would be unacceptable due to improper keying waveforms or
distortion in the RF stages.
73,
... Joe, W4TV
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