I was refering to the resonant frequency of just one loop and cable
out of the can behaving like a quarter wave shorted stub (or 3/4 wave)
for determining the cable length.
4 dB is high for a single can system isolator type system but it may
be better than using a hybrid since it does give a pass response for
TX noise. My preference now would be 2 to 3 pass can's plus Q cans
per frequency into the star so that the isolator doesn't see much of
the other close frequency energy to cause IM problems.
Harold
> > The loop and cable length presented approximately a 1/4 wave
> > or 3/4 wave shorted stub when you look at it through the star
> > with a tracking generator and spectrum analyser.
>
> > The resonance I mentioned was a minimal insertion loss or
> > the best VSWR (best return loss) at the middle of your
> > frequencies)
>
> The fly in the soup is the minimal insertion loss is not
> always in/at the middle of the selected frequencies. And
> the return loss or resonant curve/value is not a uniform
> shape.
>
> cheers,
> skipp
>
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