Scott Dattalo writes:
>Long answer:
>
>http://www.dattalo.com/technical/theory/sqwave.html

        Many thanks to all who responded.  The "long answer" at Scott
Dattalo's site is quite thought-provoking although I will have to study
it over a period of time as it has been almost twenty years since I
took what we called Technical Calculous, here so that part of my brain
is a bit rusty.  It is a wonderful thing, however, to be able to
mathematically explain real-world behavior because that is how people
come up with "magic sine waves" and other neat solutions to seemingly
intractable problems.

        The theory discussion kind of reminds me of a method of
calibrating the frequency deviation of a FM radio transmitter using
Bessel Functions.  The idea is that at a given deviation (modulation)
frequency, the side bands will cancel out the center carrier when the
deviation level is set to the correct value for the function.

        I confess that I know it as, "for 5 KHZ deviation, you set the
audio sine-wave generator to whatever the function says it should be
and then turn the deviation level up and down until the center carrier
nulls out."  In other words, I don't presently know how to compute
Bessel Functions, but only know that there is a procedure one can use
to set a transmitter's deviation level accurately with only a scope
and an accurate audio signal generator.

        Also, thanks to all for answering my original question.

Martin McCormick WB5AGZ  Stillwater, OK
OSU Information Technology Division Network Operations Group

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