[CW] I found the article

[N2EY at aol.com]

In a message dated 3/7/05 3:17:17 PM Eastern Standard Time, n1ea at arrl.net 
writes:


> I found the excellent article I was reading - here it is.


It *is* excellent! Thanks Dave - that's a keeper! 

> 
> I also send it to George W5YR as we were involved in a discussion about this 
> 
> a while ago on this reflector!
> 
> Notice that the central part of the graph shows the main signal - this gets 
> wider with keying speed.  The author seems to conclude that the spectrum 
> taken up by the sidebands - remains the same (doesn't vary with speed of the 
> 
> morse) but depends on the wave shape of the signal.
> 

What really matters from the regulators' point of view is how wide the signal 
is at the 23 db down points. I dunno why they chose 23 db down, but that's 
their standard. For OOK signals, the rise/fall times and the shape of the 
rise-fall determine that -23 db bandwidth, up to the point where the keying speed 
becomes close to the rise/fall time.

73 de Jim, N2EY