3-27
Take the square root:
Example:
A problem using this equation will illustrate how to determine the characteristics of a transmission
line. Assume that the line shown in figure 3-23 is 1000 feet long. A 100-foot (approximately 30.5 meter)
section is measured to determine L and C. The section is found to have an inductance of 0.25 millihenries
and a capacitance of 1000 picofarads. Find the characteristic impedance of the line and the velocity of the
wave on the line.
If any other unit length had been considered, the values of L and C would be different, but their ratio
would remain the same as would the characteristic impedance.
