RCA phono jacks on Heath gear

[Dexter Francis]

The equasion for determining the impedance of a coaxial line is:

Zo = 138/ square root of k times log D/d

where k is the dielectric constant of the insulator,
D is the inside diameter of the outer conductor
d is the outer diameter of the inner conductor.
Zo is the characteristic impedance.

Most folks just look up the impedance in the manufacturers catalog.

A 50 ohm line with a short section of 70 ohms in the middle is a much
bigger issue when the signal is just a few millivolts.  In weak signal
areas a couple dB of loss can make all the difference.

-- df

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