[TowerTalk] 600 Ohm Line

[Rick Karlquist]

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