audioguru: Your response is greatly appreciated, however, that link to the cross-over circuit, is only an example of the idea of cross-over, to explain what I was talking about to crutschow.
Maybe I should rephrase my question for clarity.
I am transmitting 3 frequencies: f1=100, f2=200, f3=225
Each frequency detected at the receiver does something for me, some function.
So, at my receiver, I want to have three BANDPASS filters to detect when I am receiving each signal. The center frequency of each filter is: f1=100, f2=200, f3=225.
And lets assume that the pole cut off and slope characteristics of my filters conform to roughly my center frequency plus or minus 17%.
Therefore, for my first filter:
fc=100Hz, fb=83Hz, and fa=117Hz
Second filter:
fc=200, fb=166, fa=
234
Third:
fc=225, fb=
186, and fa=264.
My fb and fa, are my 3db points, or where the Amplitude = .707.
So, as you can see, the bold numbers above have cross-over. Basically, they are too close together, and the second filters BW is so wide, or maybe close to the third filter's, that it will end up passing some of my third filters signal. Same with the third filter: it is either to close to f of the 2nd, or its BW is too wide, and it will end up passing some of the 2nd's signal?
Is my underlined statement
correct, is basically what I am asking?
Thanks