In article . com,
wrote:

thanks! also, i was just reading about mixers... and getting confused.
i've run some matlab programs to figure out how you can take something
at frequency x and frequency y, and end up with an output of frequency
(x-y). one transmitter's mixer i saw took a 160mhz and 14mhz input to
get a 146mhz output. adding or multiplying them together certainly does
not yeild 146mhz. so how does that work?

You need a nonlinear function in order to get mixing behavior, and
create the sum and difference frequencies.

If you just add (e.g.) sin 160x and sin 14x, you end up with a simple
sum of sins, and no other frequencies show up - ordinary superposition.

Run the resulting sum through a nonlinear function (e.g. square it, or
take the square root, or clip it whenever its absolute value exceeds
1.0, or something like that), and take a look at the frequency content
of what you get as a result.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!