Re: AM Modulation


<bill.sloman@xxxxxxxx>

When you modulate a carrier, you are essentially multiplying two sine
waves toegther

sine A. sin B = 0.5 .(cos (A-B) - cos(A+B))


** Shame that is NOT the formula for a normal AM wave.


This implies that you shouldn't see the carrier frequency at all,


** Because it is the wrong formula.


but few modulators are perfect multipliers.


** Normal AM ones are certainly not.

Unless the signal is "double sideband, suppressed carrier".


Electronics is really just a branch of trigometry .


** Horse manure.

"Electronics" was initially a branch of physics, then expanded to become a
branch of engineering in its own right separate from "electrical
engineering".

It is all about exploiting nature for human benefit.

Maths is just a tool to help achieve that end.



......... Phil





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