"Telamon" wrote in message
...

It is a common error to assume that digital communications are similar
to analog RF. One reason is very fast edge times are required to
create
the most eye margin possible at the decoding end of a data stream so
the
bandwidth required is much greater. A good rule of thumb is 3.7 times
the clock rate as a minimum. Usually the engineering shoots for the
fastest edge times practical.

Well, I thought we started out with harmonics of the BPL carriers. I
don't see why there would have to be BPL harmonics due to the digital
modulation anymore than a RTTY transmission would have to have
harmonics.

If you're saying the sidebands of carriers will be spaced as far as 3.7
times as far as the data clock rate, sure, why not? I don't know any of
the specifics. But if the BPL carriers stop at 80 Mhz, I suppose the
total spectrum won't go much past 80 Mhz..



An one/zero pattern and multiples thereof are square waves but I
should
not have used that term because it looks like I just threw you off the
path of understanding.

--
Telamon
Ventura, California

That's the rocky path of understanding, for ya. Can't even take take my
shoes off when I need to count past 10.

Frank Dresser