Re: Frequency Splitting

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Daniel McCauley" <dhmccauley@xxxxxxxxxxxxxxxxxxxxxxxxxx>

When two resonant circuits are coupled together, the frequency 
response contains two distinct peaks at two different 
frequencies.  This is a result of
each circuit seeing "more" of the capacitance of the other's circuit 
when they are coupled together.  So, the fres of one goes up, and the 
fres of one goes down, and
this is what you see when you perform an AC response of the coupled 
resonant circuits.

The beat frequency is the upper pole - the lower pole.  The beat 
frequency is also the frequency at which primary notching 
occurs.  Richie Burnett has some good
theory on this subject on his website.

Dan


> >We could take two identical tank circuits and couple them. We will
> >still get a beat frequency.
> >
> >Ah , but what about "frequency splitting?"
> >
> >Be realistic, they are identical tank circuits. One tank could not
> >possibly operate at a different frequency then the other. There is
> >no "splitting".
>     Doesn't a "beat frequency" result from two signals of different 
> frequency? If so, what is the source of the other frequency? If 
> not, how else does a "beat" result?
>
> >However both tank circuits will now operate at a frequency that is
> >different from the uncoupled state.
>
>     Are you saying the above observed "beat frequency" is the 
> difference between the common "coupled frequency" and the common 
> "uncoupled frequency"?
>
> -Phil LaBudde