Jim Lux said:
> 600 ohms is pretty much a standard for audio balanced pairs. Think about
> it.. 3 kHz, the wavelength is around 100 km... I think you can consider a
> phone line (or audio cable) as a lumped component, not a transmission
> line.
>
Turns out you can't consider the phone line as a lumped component
even to get audio to the CO; moreover, the characteristic impedance
is complex. This is why the phone company has to use loading
coils.
Rick N6RK
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