Transmission Line Calculator
Calculate propagation delay and electrical length of a transmission line from physical length and velocity factor.
m
MHz
Propagation Delay
50.54 ns
Electrical Length1.8 °
Wavelength in Line1.979 m
Propagation Delay vs Physical Length
Transmission Line Propagation
Formulas
v = c x VF (propagation speed)
Delay = Length / v
Electrical Length = 360 x Length / wavelength_in_line
Transmission line effects matter when the line is a significant fraction of the wavelength (typically > 1/10).
Example Calculation
10 m coax (VF = 0.66) at 100 MHz.
- 01Speed = 299.792 x 0.66 = 197.86 Mm/s
- 02Delay = 10 / 197860000 = 50.5 ns
- 03Wavelength in line = 197.86 / 100 = 1.979 m
- 04Electrical length = 360 x 10 / 1.979 = 1819 degrees
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